Xiamen Bay, located at the southern tip of the East China Sea in China, on the west side of the Taiwan Strait, near the Jiulong River Estuary in southern Fujian, starts from Baishi in Xiamen, passes through Dadan Island, Erdan Island and herring, and reaches the tower foot of Longhai City in the north. Water area154.18km2, water depth along the center of the outer and inner ports10m, and the maximum water depth is 3 1 m.