Yalong Bay is a high-quality tropical seaside scenic spot in the eastern suburbs of Sanya City, Hainan Province, People's Republic of China. It is located 28 kilometers southeast of Sanya City. The beach stretches for 7,000 meters and is flat and wide. The shallow sea area is 50-60 meters wide. The sand is white and soft, the sea water is clear and transparent, and the visibility is 7-9 meters. The annual average temperature is 25.5℃, and the sea water temperature is 22℃-25.1℃. Swimming is possible all year round. The beach is known as the No. 1 Bay in the world.

There are pristine islands and reefs, Longzai Island, on the west side of the bay. The island is surrounded by mountains, the sea water is clear and transparent, the lateral visibility can reach 18-30 meters, and the water quality is very good. There are rich species of corals, which are well-protected and colorful, mostly soft corals. There are abundant marine fish on the seabed, including funny and cute clownfish, elegant angelfish, and colorful butterfly fish. Sometimes you can also encounter spectacular fish storms. It is the best choice for leisure diving, sea fishing and underwater photography, and it is also one of the current diving experience sites in China.