Dazhou Island: also known as Bird's Nest Island, located in the southeast sea area of Wanning City, is the only national marine natural ecological protection zone along the coast around Hainan Island and the largest desert island along the coast around Hainan Island. Island consists of two islands and three peaks, with an area of about 4.36 square kilometers and the highest peak of 289 meters. It is the only Jin Siyan habitat in China. The cliff caves on the island are confusing, and Jin Siyan Island nests in groups in dark and narrow cracks. Its nest is a famous bird's nest, made of saliva glue and various materials ... Because the sea area of Dazhou Island is in the world ocean current zone, fresh seawater from the world ocean current flows all the year round, and the seawater around the island is crystal clear all the year round, and the color of seawater is dark blue, and then it is dark blue outside, indicating that the cleanliness of seawater is high, and in many cases the visibility is around 15 and 6 meters. Ruta Island is densely covered with coral reefs, and it is also an excellent place for all kinds of tropical fish to feed and inhabit. As a national nature reserve, it has not been developed by tourism, and the original scenery of the seabed is still excellent, so Hainan is also an excellent place for underwater diving and sightseeing. On the island, the peaks face each other, the cliffs hang down to the sea, the abyss is endless, and the waves press the shore, which is amazing. The island bends inward, the wind blows and surges, and the clear water flows jade. An arched silver beach connects the two mountains. At high tide, the sea cuts off the beach and connects things. At the mouth of the sea at the western end, with rugged rocks and rough waves, Wan Ru has reached a paradise and fairyland at sea.