Nansha Islands, one of the four largest archipelagos in China, is situated in the south of Hainan Province, with a latitude of 3 35'- 11 55', a longitude of 109 30'- 117 50', it is about 905 kilometers long from east to west and 887 kilometers wide from north to south. and an area of 886,000 square kilometers in the sea. Its northwest is opposite to Vietnam, its northeast is across the sea from the Philippines, and its southern waters are adjacent to the coasts of Malaysia, Brunei and Indonesia.
The main islands of Nansha Islands are Ping Island, Zhongye Island, Nanwei Island, Shell Reef, Zhenghe Group Reef and Wan'an Beach. It belongs to Sansha City, Hainan Province, China. There are disputes over the sovereignty of some islands in the Nansha Islands. The core of the disputes is the territorial sovereignty disputes over the Nansha Islands and the delimitation disputes over some sea areas in the South China Sea. According to the provisions of international law, the right of a state to the sea is based on the mainland, that is, the right to the sea is based on the right to land. The Nansha Islands is the southernmost tip of China, Zengmu Dark Sand, located at 3 degrees, 58 minutes and 20 seconds north latitude and 112 degrees, 16 minutes and 53 seconds East longitude. It consists of reef core and reef wing.
The Nansha Islands are mainly composed of phosphate rock and oil and gas resources. The southern part of the South China Sea Islands and the continental shelf oil and gas accumulation area are the main oil and gas resources areas in the South China Sea. The total area of oil and gas storage basins in the Nansha Sea area is about 350,000 square kilometers, with a total oil potential of 34.97 billion tons and a total gas potential of 8 trillion cubic meters.