Introduction to the first three islands: The first three islands refer to Pingshan Island, Dashan Island and Cheniushan Island in the south of the Yellow Sea northeast of Lianyungang, covering an area of 0.32 square kilometers. On the island is Haizhou, which is listed as one of the eight major fishing grounds in China. Bay fishery, the nearby sea area mainly grows and breeds mackerel, sea bass, yellow croaker, shrimp, etc.