Located in the sea area 6.7 nautical miles east of Zhongshan District, Dalian, it consists of Dashan Island, Ershan Island and Sanshan Island. Sanshan Island has a total area of 3.32 square kilometers and a coastline of 40 kilometers. Beaches, reefs and rock walls are scattered all over the place. Due to the special geographical location and landform, the sea water is clear and flat, and the marine resources are extremely rich: fish, shrimp, crab, sea cucumber, abalone, jellyfish, sea urchin, anemone and other marine resources.