Daya Bay, an important bay in the South China Sea. Located between Red Bay and Dapeng Bay in eastern Guangdong Province. The total area is 650 square kilometers. The hills around the bay are composed of various metamorphic rocks, purple sandstone, tuff or granite from the Paleozoic and Mesozoic ages. The coastal wheel porch is winding and changing, forming a hidden situation of the "Big Bay set small bay" in the near-shore waters. The main harbors have Chimney Bay, Da Nang, Fanhe Hong Kong, Macau Tau Port, Xiaogui Bay, Da Peng'ao. There are many islands in the bay, and there are port islands, central islands in the northwest and central areas. The bay has spicy islands and yu islands. Daya Bay is one of the best coastal bays in Guangdong Province. The bay is the best natural conditions in Dapengao, and the water depth is not silted. It is an excellent port site for the construction of large deep water piers. The aquatic products are rich and are a breeding reserve for aquatic resources in China.