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Bolshoi Ussuriysky Island (Russian: о́стров Большо́й Уссури́йский), or Heixiazi Island (simplified Chinese: 黑瞎子岛; traditional Chinese: 黑瞎子島; pinyin: Hēixiāzi Dǎo), is a sedimentary island at the confluence of the Ussuri and Amur rivers. It is divided between the People's Republic of China (PRC) and Russia. It has an area of about 327 to 350 km² and is bounded closely by Yinlong Island (Tarabarov Island), and over ninety islets (in Chinese, Heixiazi may refer only to the large island or to the island group collectively). Its position at the confluence of the Amur and the Ussuri and right next to the major Russian city of Khabarovsk, has given it great strategic importance.
Until 2004, Bolshoy Ussuriyskiy Island was the site of a territorial dispute between China and Russia. The Soviet Union occupied Bolshoy Ussuriyskiy and Yinlong Islands in 1929, but this was not accepted by China. While Russia governed the islands as a part of Khabarovsk Krai, China claimed them as a part of Fuyuan County, Heilongjiang province; the easternmost part of China.
On October 14, 2004, the Complementary Agreement between the People's Republic of China and the Russian Federation on the Eastern Section of the China-Russia Boundary was signed, in which Russia agreed to relinquish control over Yinlong Island and around half of Bolshoy Ussuriysky. About 170 square kilometres of Bolshoy Ussuriysky was transferred to China, while the rest will remain in Russia's jurisdiction. In return, China agreed to drop all territorial claims to the remainder of Bolshoy Ussuriysky kept by Russia.
The total area of these territories in the Khabarovsk region is approximately 340 square kilometres. The two sections make up less than two per cent of the Russian-Chinese border, which stretches to some 4,300 kilometres and is one of the longest land frontiers on the planet.
In 2005, the Russian Duma and the Chinese National People's Congress approved the agreement. On July 21, 2008, an agreement was signed in Beijing by the Chinese and Russian Foreign Ministers, that finalized the border demarcation and formally ended negotiations. Under the agreement, Russia would transfer approximately 174 km² of territory to China. The transfer took place on October 14, 2008.  The area being transferred to China is largely uninhabited.
The agreement has met with controversy on both sides of the border. In May 2005, Cossacks in Khabarovsk demonstrated against the loss of half of Bolshoy Ussuriysky. In return, some Chinese commentators, especially the media in Hong Kong, Taiwan and overseas which are outside the control of PRC government censorship, criticized the PRC government for signing the agreement, which they regarded as sealing as permanent the loss of former Chinese territory, such as Outer Manchuria, to Russia.
The government of the Republic of China on Taiwan (ROC) has never recognized border treaties signed by the PRC with other countries. Therefore the ROC still formally claims all parts of the Heixiazi Islands.
According to a 2002 study by Akihiro Iwashita, a Japanese specialist on Slavic relations, “Most of Khabarovsk’s local elites, in particular military, considered the islands of strategic importance since they fenced off Khabarovsk from China. If the border was drawn, relying upon the ‘main channel principle’, the two islands would have passed to China. This is why the Soviet Union insisted on the legal exceptionality of the two islands in its negotiations with China during the late 1980s, while strengthening its de facto control of these islands”.
|Territorial disputes in East, South, and Southeast Asia|
|Type||Territory||Currently administered by||Claimants|
|Land:||Aksai Chin||People's Republic of China||People's Republic of China, Republic of China1, India|
|Baekdu/Changbai Mountain||North Korea, People's Republic of China||North Korea, South Korea, People's Republic of China, Republic of China|
|Heixiazi / Bolshoy Ussuriysky (Eastern part)1||People's Republic of China, Russia||Republic of China1|
|Indo-Bangladesh enclaves2||Bangladesh, India||Bangladesh, India|
|Kachin State||Burma,||Burma, Republic of China1|
|Kashmir2||India, Pakistan||India, Pakistan|
|Korean Peninsula and its adjacent islands||South Korea, North Korea||South Korea, North Korea|
|Mainland China1||People's Republic of China||People's Republic of China, Republic of China|
|North Borneo (Sabah)1||Malaysia||Malaysia, Philippines|
|Outer Mongolia1||Mongolia||Republic of China, Mongolia|
|Pamir Mountains2||Afghanistan, Tajikistan||Afghanistan, Republic of China1, Tajikistan|
|Sixty-Four Villages East of the River1||Russia||Republic of China1, Russia|
|Arunachal Pradesh||India||People's Republic of China, Republic of China1, India|
|Tannu Uriankhai (now Tuva Republic of Russia)1||Russia||Republic of China1, Russia|
|Trans-Karakoram Tract||People's Republic of China||People's Republic of China, Republic of China1, India|
|Islands and waters:||Senkaku Islands / Diaoyutai||Japan||People's Republic of China, Republic of China, Japan|
|Quemoy||Republic of China||People's Republic of China, Republic of China|
|Kori Creek1||India, Pakistan||India, Pakistan|
|Liancourt Rocks||South Korea||South Korea, North Korea1, Japan|
|Macclesfield Bank||People's Republic of China, Republic of China, Philippines|
|Matsu||Republic of China||People's Republic of China, Republic of China|
|Paracel Islands||People's Republic of China||People's Republic of China, Republic of China, Vietnam|
|Pedra Branca, Middle Rocks, and South Ledge||Singapore||Malaysia, Singapore|
|Pratas Islands||Republic of China||People's Republic of China, Republic of China|
|Scarborough Shoal||People's Republic of China, Philippines||People's Republic of China, Republic of China, Philippines|
|Socotra Rock||South Korea||South Korea, People's Republic of China1|
|Southern Kuril Islands||Russia||Russia, Japan|
|Spratly Islands2||People's Republic of China, Republic of China, Malaysia, Philippines, Vietnam||Brunei, People's Republic of China, Republic of China, Malaysia, Philippines, Vietnam|
|Taiwan and Penghu1||Republic of China||People's Republic of China, Republic of China|
2Divided among multiple claimants.
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