East China Sea EEZ disputes

There are disputes between China, Japan, Taiwan and South Korea over the extent of their respective exclusive economic zones (EEZs) in the East China Sea.

The dispute between the People's Republic of China (PRC) and Japan concerns the different application of the 1982 United Nations Convention on the Law of the Sea (UNCLOS), which both nations have ratified. China proposed the application of UNCLOS, considering the natural prolongation of its continental shelf, advocating that the EEZ extends as far as the Okinawa Trough.

In 2012, China presented a submission under the UNCLOS concerning the outer limits of the continental shelf to the UN. Japan, based on UNCLOS, proposed the Median line division of the EEZ.

Under the United Nations' Law of the Sea, the PRC claims the disputed ocean territory as its own Exclusive Economic Zone (EEZ) due to its being part of PRC's natural extension of its continental shelf, while Japan claims the disputed ocean territory as its own EEZ because it is within 200 nautical miles (370 km) from Japan's coast, and proposed a median line as the boundary between the EEZ of China and Japan. About 40000 km2 of EEZ are in dispute. China and Japan both claim 200 nmi of EEZ rights, but the East China Sea width is only 360 nmi. China claims an EEZ extending to the eastern end of the Chinese continental shelf (based on UNCLOS III) which goes deep into the Japanese's claimed EEZ.

In 1995, the People's Republic of China (PRC) discovered an undersea natural gas field in the East China Sea, namely the Chunxiao gas field, which lies within the Chinese EEZ while Japan believes it is connected to other possible reserves beyond the median line. Japan has objected to PRC development of natural gas resources in the East China Sea near an area where the two countries Exclusive Economic Zone (EEZ) claims overlap. The specific development in dispute is the PRC's drilling in the Chunxiao gas field, which is located in undisputed areas on China's side, three or four miles (6 km) west of the median line proposed by Japan. Japan maintains that although the Chunxiao gas field rigs are on the PRC side of a median line that Tokyo regards as the two sides' sea boundary, they may tap into a field that stretches underground into the disputed area. Japan therefore seeks a share in the natural gas resources. The gas fields in the Xihu Sag area in the East China Sea (Canxue, Baoyunting, Chunxiao, Duanqiao, Wuyunting, and Tianwaitian) are estimated to hold proven reserves of 364 BCF of natural gas. Commercial operations began 2006. In June 2008, both sides agreed to jointly develop the Chunxiao gas fields.

Rounds of disputes about island ownership in the East China Sea have triggered both official and civilian protests between China and Japan.

The dispute between PRC and South Korea concerns Socotra Rock, a submerged reef on which South Korea has constructed a scientific research station. While neither country claims the rock as territory, the PRC has objected to Korean activities there as a breach of its EEZ rights.

South Korea opened a museum in central Seoul in 2012 to back its claim to the Liancourt Rocks. Visitors can walk around a large 3-D model of the island and examine video and computerized content on the island's history and nature. Video screens show live footage of the island from a fixed camera. In January 2018 the Japanese government opened a small museum in Tokyo displaying maps and documents to defend its territorial claims against neighboring South Korea and China.