Located north of Yongle Islands, Xisha Islands in the South China Sea, Yinyu Island is northeast of Yagong Island and southwest of Quanfu Island. It is small sandbar. There is a deep pit on the table reef. The water in the pit looks black blue, and the temperature is relatively low. It is called the "Dragon Pit." It is also called "Yinyu" by Chinese fishers. Yinyu Island is formed by coral sand and reef. It is one of the most spectacular islands in Yongle Islands. The ecological environment of the island is well preserved. Visitors can see many kinds of crabs, shells, fish and hermit crabs. In addition, there are many stranded boats, ideal for shooting photos with a touch of artistic charm.