Bajo de Masinloc, and tasked the National Mapping and Resource Information Authority (NAMRIA) to use the name in official maps. In July 2017, to assert its sovereignty, Indonesia renamed the northern reaches of its exclusive economic zone in South China Sea as the North Natuna Sea, which is located north of the Indonesian Natuna Islands, bordering southern Vietnam exclusive economic zone, corresponding to southern end of South China Sea. The "Natuna Sea" is located south of Natuna Island within Indonesian territorial waters. Therefore, Indonesia has named two seas that are portions of South China Sea; the Natuna Sea located between Natuna Islands and the Lingga and Tambelan Archipelagos, and the North Natuna Sea located between the Natuna Islands and Cape Cà Mau on the southern tip of the Mekong Delta in Vietnam. Geography According to International Hydrographic Organization (IHO) Limits of Oceans and Seas, 3rd edition (1953), it is located. south of Chinese mainland, south of Hainan, west of Taiwan; east of Vietnam; west of the Philippines; east of the Malay Peninsula, up to the east entrance of Strait of Singapore, and south of the Bintan and Batam Islands; the northeast coast of Sumatra; and north of the Bangka Belitung Islands and Borneo. However, in its unapproved draft 4th edition (1986), IHO proposed the Natuna Sea, thus South China Sea southern boundary was shifted northward, from north of the Bangka Belitung Islands to north and northeast of Natuna Islands. States and territories with borders on the sea (clockwise from north) include: the People's Republic of China, the Republic of China (Taiwan), the Philippines, Malaysia, Brunei, Indonesia and Vietnam. Major rivers that flow into South China Sea include the Pearl, Min, Jiulong, Red, Mekong, Menam, Rajang, Baram, Kapuas, Batang Hari, Musi, Kampar, Indragiri, Pahang, Agno, Pampanga and Pasig Rivers. Extent The International Hydrographic Organization in its Limits of Oceans and Seas, 3rd edition (1953), defines the limits of South China Sea as follows: On the South. The Eastern and Southern limits of Singapore and Malacca Straits [A line joining Tanjong Datok, the Southeast point of Johore () through Horsburgh Reef to Pulo Koko, the Northeastern extreme of Bintan Island (). The Northeastern coast of Sumatra] as far West as Tanjong Kedabu () down the East coast of Sumatra to Lucipara Point () thence to Tanjong Nanka, the Southwest extremity of Banka Island (where it transitions as Java Sea), through this island