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Yen Bai province

Yen Bai province
Tỉnh Yên Bái
—  Province  —
Nickname(s): Tranquillity
Location of Yen Bai within Vietnam
Coordinates: 21°30′N 104°40′E / 21.5°N 104.667°E / 21.5; 104.667Coordinates: 21°30′N 104°40′E / 21.5°N 104.667°E / 21.5; 104.667
Country  Vietnam
Region Northeast
Capital Yen Bai
 • People's Council Chair
 • People's Committee Chair Hoàng Xuân Lộc
 • Total 6,899.5 km2 (2,663.9 sq mi)
Population (2008)
 • Total 750,200
 • Density 109/km2 (280/sq mi)
 • Ethnicities Kinh, Tày, Dao, H'Mông
Time zone ICT (UTC+7)
Calling code 29
ISO 3166 code VN-06
Website yenbai.gov.vn

Yên Bái (About this sound listen) is an agricultural-based province located in Tay Bac, the northern part of northern-central Vietnam. It shares borders with five provinces which are Lao Cai province, Lai Chau province, Son La province, Tuyen Quang province, and Phu Tho province.[1] The province covers an area of 6899.5 square kilometres and as of 2008 it had a population of 750,200 people.[2]

Yen Bai's history is important under the French colony, particularly the subsequent "Yen Bai mutiny", an uprising of Vietnamese soldiers in the French colonial army on 10 February 1930 in collaboration with civilian supporters who were members of the Viet Nam Quoc Dan Dang (VNQDD, the Vietnamese Nationalist Party).[3][4]

Forestry and farming are the main economic stay of the province. Thac Ba Lake is a natural asset of the country along with its Thac Ba Hydroelectric Plant. Dong Cuong Festival is an important festival of the province.[1][5]



The province's name derives from Sino-Vietnamese (Hán Tự: ).


According to the General Statistics Office of the Government of Vietnam, the population of Yên Bái province as on 2008 was 750,200 with a density of 109 persons per sqkm over a total land area of 6,899.5 square kilometres (2,663.9 sq mi) of the province.[6] The male population during this period was 372,000[7] with females accounting for 378,200.[8] There are many ethnic groups in Yen Bai Province. Kin people who form the majority population of the country, settled here long time back and in unison with the local minority tribes established themselves in the region and developed cultivation practices. Kin people’s ancestry is traced to the Hai Duong Pham Ba Luc for nine generations till date and a monument erected in 1937 in Doc village in Hong Commune is highly revered as an ancestral home.[9]


The area was occupied in ancient times, given the favourable communications along the Hong and Chay Rivers. Several archaeological digs in the province have unearthed ancient temples and other sites. Stone tools have been excavated in Mù Cang Chải District. In 1285, the Battle of Thu Vat took place under the command of Tran Nhat Duat against Mongolian invaders at Thac Ba Lake.[10]

Vietnam had gradually become a French colony between 1859 and 1883.[11] Initially, military resistance to French rule came through the Can Vuong movement led by Ton That Thuyet and Phan Dinh Phung, which sought to install the boy Emperor Ham Nghi at the head of an independent nation. However, with the death of Phung in 1895, military opposition effectively ended. The only other notable incidents after this came in 1917 was the Thai Nguyen rebellion. The lack of militant activity changed in the late 1920s with the formation of the VNQDD, or Vietnamese Nationalist Party.[12] The VNQDD attempted clandestine activities to undermine French rule, which resulted in French scrutiny of their activities. This led to their leadership group taking the risk of staging a large scale military attack in the Red River Delta in Northern Vietnam. It was only on 10 February 1931 that VNQD could, in collaboration with civilian supporters, launch the Yên Bái mutiny, an uprising of Vietnamese soldiers in the French colonial army. Thus, Yen Bai was the first of the battles during the First Indochina War. Yen Bai and Thai Yugyen were key military posts of the Viet Minh, which were supplied with arms from China to fight the French during this War.[13]

On 9 February 1930 part of the 4th Regiment of Tonkinese Rifles stationed at Yen Bai mutinied against their French officers but were suppressed by loyal troops from the same unit. The attack was the largest disturbance against the colonisation of Vietnam since the Can Vuong monarchist movement of the late 19th century. The aim of the revolt was to inspire a wider uprising among the general populace in an attempt to overthrow the colonial regime and establish independence. The Viet Nam Quoc Dan Dang (VNQDD, the Vietnamese Nationalist Party) had previously attempted to engage in clandestine activities to undermine French rule, but increasing French scrutiny on their activities led to their leadership group taking the risk of staging a large scale military attack in the Red River Delta in northern Vietnam. This incident led to wide spread disturbances against French rule across northeastern Vietnam during 1930–31.

In the "Yen bai Uprising of 1930" against the French colonial rule, many French army officers were killed. To putdown the uprising, the French resorted to aerial bombardment and even Napalm Bombs were used. The rebellion was put down ruthlessly by the French within a day; many Vietnamese soldiers and 12 VNQDD leaders were executed. Following this repressive action by the French, there were frequent anti-colonialist strikes and riots throughout the country, which were all put down ruthlessly. This resulted in breaking the backbone of the VNQDD and the Communist Party in North Vietnam for a considerable period.[13]

The French maintained control of their colonies until World War II, when the Japanese war in the Pacific triggered the invasion of French Indochina in 1941.

In 1961, a large bronze cylindrical jar was discovered with carved images of males and females in copulation. In 1964 an 80,000 year old skeleton was unearthed in Hum Cave in Luc Yen District. In 1996, another bronze jar was discovered along with the 2000 year old remains of a 6 year old girl on Choi Mountain in the commune of Hop minh, Tran Yen District.[9]

  Geography and climate

  Map showing Thac Ba Lake and Red River.

Yên Bái covers an area of 6,899.5 km2 (2,663.9 sq mi), and the Red River passes through the province. Yên Bái is a mountain province, characterised by rugged mountainous scenery and green rice paddy fields in the valleys. The Hoàng Liên Sơn mountain range runs through the province. The Red (or Thao) River and Chay River flow the province. Their origin is in the Yunnan, China. The valley created by these two river systems in the Yen bai Province is fertile, though an uneven territory; Muong Lo plain is the rice bowl of the province.[14]

  Khau Pha Pass in national highway No.32 in Mù Cang Chải District

The topography is steep, rising from east to west and from south to north. The average elevation is about 600 metres (2,000 ft) above sea level and can be divided into two regions: low-lying regions on the left bank of the Red River basin and the high right bank of the Red River and in the plateau between the Red River and Da River there are many mountains. Besides the two main rivers, the Red and the Da, the province has about 200 canals, small streams and large lakes and swamps. Thac Ba Lake is situated in the province, an artificial lake which has an area of 23,400 hectares (90 sq mi) and 1,331 islands and hills.[10] It has a capacity of 3 to 3.9 billion cubic meters of water and its original intention was to run the Thac Ba hydroelectric plant, one of the first large hydropower projects in Vietnam. The water in the lake is blue and clear, and reflects the surrounding green forests. The thousands of hills and islands have many caves, including Hum, Cau Cuoi and Bach Xa. A Thac Ba Temple is located in the lake area.[10] Thac Ba Lake has changed the climatic pattern in the western districts of the province, to a moderate condition from its hot and dry status.[15]

The main ecozones of the province are rainforest, subtropical and temperate mountainous zones. It experiences a tropical monsoon season. The 20,293 hectares (78.35 sq mi) conservation area Mu Cang Chai Species / Habitat Conservation Area (MCC SHCA) was established in 2004 to protect the endangered mountain wildlife in Cang Chai district on the border of Lào Cai Province.[16]

The mean temperature in the province at elevations above 1500m is about 20 °C (68 °F) and drops to 0 °C (32 °F) with frost and snow in some parts. December–January are winter months when the climate is dry. Frequent drizzle is experienced during late winter months; this type of rain has earned Yen Bai the epithet "drizzle centre of the country”. April to December are summer months and the rainy period. The mean temperature is stable for the district as a whole and is in the range of 18 °C (64 °F) to 28 °C (82 °F).[1][17]

  Archaeological findings

Many archaeological findings have been unearthed in the provinces in places, which date human settlement between hoary 8000 years to the recent 2000 years; these have been preserved in the Archaeological Museum in Yen Bai City. The archaeological antiquaries found are; a large cylindrical jar in Dao Thinh Commune depicting scene of human cohabitation, a skeleton of an ancient Viet and another bronze jar containing the remnants of a six year old girl in Hum Cave in Luc Yen.[9]


Yên Bái is divided into: one city (thành phố) (Yên Bái); one town (thị xã) (Nghĩa Lộ); seven districts (huyện):Lục Yên, Mù Cang Trải, Trạm Tấu, Trấn Yên, Văn Chấn, Văn Yên and Yên Bình; 11 rural districts; 10 precincts; and 159 communes.[18]

Name Division type Population (2003) Area (km²) Towns (huyện lỵ or thị trấn) (bold)
and communes (xã)
Yên Bái City (thành phố) 78,016[19] 58[19] Wards (phường): Yên Thịnh, Đồng Tâm, Minh Tân, Nguyễn Phúc, Nguyễn Thái Học, Hồng Hà, Yên Ninh.
Communes: Minh Bảo, Tân Thịnh, Nam Cường, Tuy Lộc, Văn Phú, Văn Tiến, Hợp Minh, Giới Phiên, Phúc Lộc and Âu Lâu.
Nghĩa Lộ Township (thị xã) 25,256[19] 29[19] Wards (phường): Trung Tâm, Tân An, Cầu Thia and Pú Trạng.
Lục Yên District District (huyện) 100,785[19] 811[19] Yên Thế, Tân Phượng, Lâm Thượng, Khánh Thiện, Minh Chuẩn, Khai Trung, Mai Sơn, An Lạc, Tô Mậu, Khánh Hòa, Động Quan, Trúc Lâu, Phúc Lợi, Trung Tâm, An Phú, Phan Thanh, Minh Tiến. Tân Lập, Liễu Đô, Vĩnh Lạc, Mường Lai, Xuân Minh, Yên Thắng, Tân Lĩnh
Mù Cang Chải District District (huyện) 42,574[19] 1199[19] Mù Cang Chải, Kim Nọi, Hồ Bốn, Chế Tạo, Khao Mang, Dế Su Phình, Chế Cu Nha, Cao Phạ, Púng Luông, Nậm Khắt, Mồ Dề, Nậm Có, La Pán Tẩn and Lao Chải.
Trạm Tấu District District (huyện) 21,887[19] 742[19] Trạm Tấu, Bản Mù, Bản Công, Xà Hồ, Hát Lừu, Trạm Tấu, Pá Hu, Làng Nhì, Tà Si Láng, Phình Hồ, Pá Lau and Túc Đán
Trấn Yên District District (huyện) 96,949[19] 691[19] Cổ Phúc, Vân Hội, Tân Đồng, Hưng Khánh, Đào Thịnh, Xã Hồng Ca, Việt Cường, Lương Thịnh, Hòa Cuông, Báo Đáp, Cường Thịnh, Minh Quán, Nga Quán, Quy Mông, Kiên Thành, Y Can, Minh Tiến, Việt Thành, Bảo Hưng, Việt Hồng, Minh Quân, Hưng Thịnh and Thị trấn
Văn Chấn District District (huyện) 138,684[19] 1205[19] Sơn Thịnh, Nông Trường Liên Sơn, Nông Trường Nghĩa Lộ, Nông Trường Trần Phú, Suối Bu, Suối Giàng, Suối Quyền, Đồng Khê, Tân Thịnh, Chấn Thịnh, Thượng Bằng La, Minh An, Nghĩa Tâm, Bình Thuận, Đại Lịch, Phù Nham,Thanh Lương, Thạch Lương, Hạnh Sơn, Phúc Sơn, Nghĩa Sơn, Sơn Lương, Nậm Lành, An Lương, Nậm Mười, Sùng Đô, Gia Hội, Nậm Búng, Tú Lệ, Cát Thịnh and Sơn A
Văn Yên District District (huyện) 111,715[19] 1389[19] Mậu A, Lang Thíp, Châu Quế Thượng, Châu Quế Hạ, Lâm Giang, An Bình, Quang Minh, Đông An, Phong Dụ Hạ, Phong Dụ Thượng, Xuân Tầm, Tân Hợp, Đông Cuông, Mậu Đông, Ngòi A, Yên Thái, Yên Hưng, Yên Hợp, Xuân Ái, Hoàng Thắng, Viễn Sơn, Mỏ Vàng, Nà Hẩu, Đại Sơn, Đại Phác, Yên Phú.
Yên Bình District District (huyện) 107,882
773.196 Yên Bình, Thác Bà, Phú Thịnh, Văn Lãng, Tích Cốc, Cảm Ân, Phúc Ninh, Bảo Ái, Mỹ Gia, Tân Nguyên, Yên Thành, Xuân Long, Phúc An, Cẩm Nhân, Vũ Linh, Ngọc Chấn, Yên Bình, Xuân Lai, Vĩnh Kiên, Bạch Hà, Hán Đà, Mông Sơn, Thịnh Hưng, Tân Hương, Đại Đồng and Đại Minh


The total area of the province is 689,900 hectares (6,899 km2), out of which the agricultural area is 78,600 hectares (786 km2), forest land forms major part of 453,600 hectares (4,536 km2), homestead land accounts for 4,000 hectares (40 km2) and land used for special purposes is 30,200 hectares (302 km2).[20] The per capita production of cereals in 2008 was 289 kg.[21]

  Rice farming in Vietnam

Yen Bai is home to 281 cooperatives, which are considered an effective way of generating employment to thousands of workers. These cooperatives are engaged in fields such as agricultural services, industrial services, construction, commerce, transportation, People's Credit Funds and health care. Cooperatives services include the production of black tea (manufacturing and processing), farm and forestry, fertilizers, transportation, electric supply in rural areas, and so forth.[22]

  Gem market in Lục Yên District, Yen Bai Province

A survey of the economic situation in Yen Bai carried out in 2006 indicated that living standards had increased substantially. For the period 1990 to 2004, Gross domestic product (GDP) tripled with an average increase of 7.5% per year. Poverty index decreased from 58% in 1993 to 16% in 2006 (as per General Statistics Office, 2006). However, underemployment, unstable income, inadequate childcare, limited access to health, child labour, social issues related to old people and social evils, gender inequality needed to addressed.[23]


  Rice fields in Trạm Tấu District

Farming, in particular, has been adopted as an important means for the acceleration of socio-economic development in rural areas. A reorganization of farming economy is planned through the establishment of centralized commodities production zones to enhance rural income, value of the land and levels of farming household income through agricultural extension services. In terms of agricultural products, main crops in the province include tea, cinnamon, glutinous rice, grapefruit, orange, taro and fish. About 700 farms are reportedly engaged in growing trees for pulp production, tea, cinnamon trees, breeding poultry, cattle and pigs.[24]

In the mountainous northern region, non-timber forest products in an area of 5,000,000 hectares (50,000 km2) are planned under a reforestation program, which includes about 40,000 hectares (400 km2) under cinnamon; 15,000 hectares (150 km2) have been developed.[25]

Farming extension services

The Centre for Agricultural and Forestry Extension offices of the Yen Bai province takes care of agricultural and forestry extension work in more than 1,000 villages in 180 communes and precincts in the province. For this purpose a strong agricultural extension system from the provincial to grassroots levels has been established. The dissemination work carried out by the Extension Offices have involved: knowledge transfer of technological advances; shifting in the structure of plants, animals and crops; intensive farming of hybrid rice strains; changing one-crop rice fields to two-crop ones; cultivation on sloping soil; raising high-quality chickens and so forth.[26]

25 key agricultural extension programmes have been developed to meet different growing periods in different terrains namely low lying and mountainous land. Further, more than 50 planting and husbandry models have been adopted envisaging new farming methods, centred on developing food, industrial plants and stock breeding for trading. Intensive farming of winter maize on two-rice-crop fields, intensive farming of hybrid rice strains in mountainous district of Mu Cang Chai, planting high-quality rice, sugar cane, coffee strains, raising chickens, planting forests have also been adopted by the farmers [26]



In all, 33 ores and minerals are currently mined in the numerous quarries in Lục Yên District, out of which 23 are valid minerals, including gemstones. Among these ores and minerals are: apatite, biotite, calcite, chlorite group, chondrodite, corundum, danburite, elbaite, fluor-cannilloite, graphite, humite, lepidolite, varieties of microcline such as amazonite, muscovite, olivine, orthoclase, paragonite, pargasite, phlogopite, pyrite, quartz and smoky quartz, rossmanite, rutile, schorl, spinel, titanite and tourmaline; gemstones such as rubies, spinel, and tourmaline. Luc Yen is particularly famous for its rubies.[27]

  Water resources

  Gem mines in Lục Yên District, Yen Bai Province

The Chay River, the second largest tributary of the Lo River, which in turn joins the Mekong River, rises from the Tay Con Linh mountain range (in Vietnam) at a height of 2,419 metres (7,936 ft). After flowing towards the west, it flows further southeast in the middle and lower reaches, at which point it joins the Lo River at Doan Hung. The basin is delimited by high mountain ranges—in the north by ranges[which?] of 1,500 metres (4,900 ft) to 2,000 metres (6,600 ft) in height, on the west by the Con Voi mountain range and on the east and south east by the Tay Con Linh range. The width of the river is wide in its upper reaches and "tapers to an elongated shape in the middle and lower reaches". The basin has an area of 6500 km2 (1620 km2 in China) with 60% area below an elevation of 400 m (average elevation of the basin is 858 m). The annual rainfall in the basin varies from 1,500 mm to 3,000 mm with rains concentrated (75–85%) during May to October.[28]

Water from the Chay River that flows through the Yen Bai district has been tapped for hydropower generation, irrigation water supply in the downstream area, aquaculture and river navigation.[29]

  Thac Ba Hydropower Plant

The Thac Ba Hydropower Plant is a major hydropower project located within the province on the Chay River, built between 1964 and 1971 with assistance from the Soviet Union. Construction began on August 19, 1964. Despite frequent air strikes by the United States Air Force during this period, the first unit of the power plant was commissioned on October 5, 1971; the second unit followed on August 1972, and the third unit on May 19, 1972. The power plant currently has a capacity of 120 MW, and has an energy generating potential of 400 million kWh/year. The project as built has a dam 48 m high and 657 m long, creating a gross storage capacity of 2.49 cubic kilometres) with a live storage of 2.16 cubic kilometres on the Chay River draining a catchment of 6430 km2 at the dam site. The reservoir is 60 km with a water spread of 235 km2 at the Full Reservoir Level of +58 m. The project has been designed for a maximum flood discharge of 3,650 m3/s. The other ruling levels of the project are: dead storage level in the reservoir +46.0m and maximum flood level of +59.65 for a thousand-year flood.[30][31]

Every year, the Yen Bai Provincial People’s Committee arrange the Thac Ba Discovery Festival, supported by Lao Cai, Phu Tho and Yen Bai provinces. It is held in the vicinity of the Thac Ba Hydroelectric Power Plant. Participants in the festival typically visit the lake and take part in a boat race that is held there. A village festival showcasing ethnic minorities, a trade fair, a costume show, sports and traditional art competitions are also held.[32]

Thac Ba Lake
  Thác Bà Lake

The water resource development of the province is thus centred on artificial Thac Ba Lake, which was created for hydropower development. The lake has an area of 23,400 hectares (234 km2) and has 1,331 islands. The hill catchment has a varied ecology; an interesting feature in the catchment with its beautiful landscape is thousands of hills and islands which have caves like the Hum, Cau Cuoi and Bach Xa. There is also a temple on the banks of lake known as Thac Ba Temple. The site that the lake now lies in was the historic scene in 1285 AD during the Thu Vat Battle that took place under the command of Tran Nhat Duat against Mongolian invaders. Thac Ba Lake is now an ecological tourist centre with entertainment, mountain climbing and hiking facilities.[33][34] The Mong Son Grotto, which housed the Yen Bai Party Committee during the anti-American resistance is located at the centre of this lake.


  A main road near Nghĩa Lộ

The Yen Bai city is an important transport hub of Northern Vietnam.


Yen Bai lies on the railway that runs northwest from the capital and largest city in the north of the country, Hanoi, to the border town of Lao Cai and into Yunnan in China. The railway also passes through the towns of Mau A and Co Phuc. The railway has been a major freight corridor between China and Vietnam since its construction, and runs approximately along the Red River. The National Road 70 is the highway that goes from Lao Cai southeast into Yen Bai Province, through Yen Binh just north of the town of Yen Bai, and joins up with National Road 2—which leads to Hanoi—at Doan Hung.[1][35][36]


Running parallel to and a few kilometres to the southwest of National Road 70 is National Road 32, which goes from Hanoi northwest to the town of Yen Bai through Son Tay, Lam Thao and Phu Tho Province. National Road 37 connects the town of Yen Bai to Nong Truong Tran Phu to the south. The latter town is also serviced by National Road 32, which takes a northwesterly direction through Nghia Lo, Nong Truong Lien Son into the mountainous northwest of the province and into neighbouring Lao Cai Province. The province lies about 183 km away on the 340 km Lao Cai to Ha Noi road.[1][35][36]


Yen Bai Airbase (ICAO: VVYB) is located about 5 km north of downtown Yen Bai. It is currently used as a training facility for fighter pilots serving in the Vietnam People's Air Force.

  Culture and festivals

Dong Cuong and Dai Cai are two temples in the province. Dai Cai Temple has been built amidst a large lush green is approached from riverside roads. Excavations by Archaeologist have found relics of Son Vi culture in the Dong Cuong Temple area.


Many festivals are celebrated in the province, as decided by an Organising Board. Some of the important festivals are:[37]

Dong Cuong temple festival

Dong Cuong Temple Festival is held in the Dong Cuong commune, Van Yen district, where the temple is located. The festival rites performed present an array of events starting with an invitation to the living and the dead, royal offerings, a procession of the palanquins of the Tutelary God and Holy Mother. The festival features traditional cultural and sport activities such as xoe dance, con throwing, en playing and traditional opera singing.[37]

  A monument in Nghĩa Lộ
Muong Lo cultural week

The Muong Lo Cultural Week held in the month of October in Nghia Lo town marks the anniversary of the liberation of Nghia Lo. Festivities lasting one week include sports competitions, Tay Bac (North West) Fair and a food and drink competition.[37]

Suoi Giang panpines festival

The Suoi Giang Panpines Festival held in June in Suoi Giang commune, Van Chan district, features dances, visit to Suoi Giang tea tree followed by a tea ceremony of the Mong ethnic minority people. Visits to traditional cultural villages and to Tap Plang Waterfall are also part of the programme.[37]

Grapefruit flower festival

The Grapefruit flower festival is held in September at Kha Linh communal house, Dai Minh commune, Yen Binh district, featuring the Kha Linh Communal House, grapefruit flower offerings, community tours to the Ngoi Tu cultural village and traditional sports.[37]

Nam Cuong Temple Festival

The Nam Cuong Temple Festival is held sometime in March in Nam Cuong commune, Yen Bai city, when pigeons are released by the villagers seeking peace; boat race in Nam Cuong lake and a tug-of-war competition are also part of the festival.

Mong ethnic cultural festival

Prosperity to the local the Mong ethnic people centred on an ancient tea tree in Suot Giang in this province. The tree gradually helped them to raise their standard of living. To commemorate this tree, the Mong ethnic cultural festival is held to glorify the value of this tree. During the festival, a ritual is done at the ancient tree by the head of the village as a symbolic representation of the history and culture of the land. Khen dancing, Pao throwing and the tug of war and other cultural events are also held, as part of this festival.[38]

Other places of interest to visit are the Mu Cang Chai species and bio-landscape reserve, the western region of white bauhilia flower and the Giang Spring.[37]



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  3. ^ Maurice Rives, pp. 72–73
  4. ^ Marr, p. 55
  5. ^ "Exploit water Resources:Must Thac Ba Harmony". Su Cong Thuong Yen Bai. http://webcache.googleusercontent.com/search?q=cache:5JcyvUppSr4J:sctyenbai.gov.vn/en/node/218+Water+Resources+of+Yen+Bai&cd=1&hl=en&ct=clnk&gl=in. Retrieved 2010-06-19. 
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  9. ^ a b c Lam, pp. 83-84
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  11. ^ Duiker, pp. 157–162.
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  14. ^ Lam, p. 5
  15. ^ Lam, p.6
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  20. ^ "Land use by province (As of 1 January 2008)". General Statistics Office of the Government of Vietnam. http://www.gso.gov.vn/default_en.aspx?tabid=466&idmid=3&ItemID=8597. Retrieved 2010-06-19. 
  21. ^ "Production of cereals by province". General Statistics Office of the Government of Vietnam. http://www.gso.gov.vn/default_en.aspx?tabid=469&idmid=3&ItemID=8883. Retrieved 2010-06-19. 
  22. ^ "Yen Bai: For more cooperative work of quaYen Bai: For many cooperatives do an effective". Yu Bai City. http://sctyenbai.gov.vn/en/node/220. Retrieved 2010-06-20. 
  23. ^ "Result of Nation-Wide Survey on the Family in Viet Nam 2006" (pdf). General Statistics Office (GSO) of the Ministry of Culture, Sports and Tourism. http://www.unicef.org/eapro/bao_cao_tom_tat_tienganh.pdf. Retrieved 2010-06-20. 
  24. ^ "Farm economy development in Yen Bai and outstanding issues". Government of Vietnam. http://xttmnew.agroviet.gov.vn/TestE/load/tn-spec-nodate-detail.asp?tn=tn&id=21683. Retrieved 2010-06-19. [dead link]
  25. ^ "Cinnamon-Based Fallow In Vietnam". Government of Vietnam. http://xttmnew.agroviet.gov.vn/en/stories/TinTiengAnh/Cinnamon-basedFallowInVietnam.asp. Retrieved 2010-06-20. [dead link]
  26. ^ a b "Bringing technological advances to mountainous areas in Yen Bai". Communist Part of Vietnam On line News Paper. 2003-08-08. http://www.cpv.org.vn/cpv/Modules/News_English/News_Detail_E.aspx?CN_ID=142743&CO_ID=30462#MMshw3DiMHdy. Retrieved 2010-06-21. 
  27. ^ Minerals of Luc Yen district at Mindat.org
  28. ^ "Chay River" (pdf). Vietnam 7. Flood Control Department of Vietnam. pp. 264–265. http://flood.dpri.kyoto-u.ac.jp/ihp_rsc/riverCatalogue/Vol_05/11_Viet_Nam-7.pdf. 
  29. ^ Chay, p. 273
  30. ^ "Thac Ba Hydropower". Vietnam National Committee on Large Dams and Water Resources Development. http://www.vncold.vn/En/Web/Content.aspx?distid=333. Retrieved 2010-06-19. 
  31. ^ "Hydroelectric Power Plants in Vietnam". Thac Ba. Powerplant Around the World. http://www.industcards.com/hydro-vietnam.htm. Retrieved 2010-06-19. 
  32. ^ "Thac Ba Discovery Festival 2009 To Kick Off". Paloma Cruising Halong Bay. http://www.palomahalongcruise.com/travel-news/News_Events/Thac_Ba_Discovery_Festival_2009_to_kick_off.html. Retrieved 2010-06-19. 
  33. ^ "Thac Ba Lake, Yen Bai". Tripadviser. http://www.vietnamtripadvisor.com/Travelguide/YenbaiAttraction/thacbalakeyenbai. Retrieved 2010-06-19. 
  34. ^ Chay, p 275
  35. ^ a b Rough Guide Map: Vietnam, Cambodia & Laos. Rough Guides. 2006. ISBN 978-1-84353-702-1. http://webcache.googleusercontent.com/search?q=cache:fkfnZksO-XAJ:www.roughguides.com/website/shop/products/default.aspx%3Fproductid%3D667+Rough+Guide+Map:+Vietnam,+Cambodia+%26+Laos&cd=1&hl=en&ct=clnk&gl=in. 
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  38. ^ "Mong ethnic cultural festival opens in Yen Bai province". Communist part of Vietnam National News Paper. 2007-10-18-27. http://www.cpv.org.vn/cpv/Modules/News_English/News_Detail_E.aspx?CN_ID=142743&CO_ID=30462#MMshw3DiMHdy. Retrieved 2010-06-20. 


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