Huangyan Island, formerly known as Democratic Reef, was first discovered by China and named Huangyan Island by China, so it belongs to China from beginning to end and is an inseparable part of China. Huangyan Island has a very important strategic position, which not only has a huge reef area, but also provides a natural haven for fishing boats.
Huangyan Island is a "few but fine" island reef in the zhongsha islands, because it is the only island reef with rocks exposed to the sea in the surrounding dozens of kilometers. In addition, Huangyan Island is not only geographically superior, but also rich in mineral resources, fish resources and oil resources in the nearby waters, which plays a vital role in Hainan's economic development.
topography
Huangyan Island is a slightly triangular atoll. The atoll is surrounded by shallow lakes, and the water color is green, which is different from the dark blue and black water outside the reef. Atolls have developed near the sea surface, and there are some high coral reefs, which are above the water surface and look like islands from a distance. There is a giant reef named "Huangyan" on the north side of the atoll. There is also a water reef called "Nanyan" on the south reef plate.
The entrance of the shallow lake is in the southeast, and there are reefs on the channel near the south and north. This intake canal is 9- 1 1 m deep and 360-400 m wide. Outside the reef is the deep water area, and the reef rises from the 4000-meter deep-sea basin to the sea like a chimney. Here, the crust is thin, with high gravity anomaly, and it is an atoll of Dayang Island.
Reference to the above content: Baidu Encyclopedia-Huangyan Island