the postcode of chashan village, Daya bay west area, Huizhou city, Guangdong province is 516183.

Daya Bay is an important bay in the South China Sea of China. Located between Honghai Bay and Dapeng Bay in the east of Guangdong Province. The total area is 651 square kilometers. The hills around the bay are composed of various metamorphic rocks, purple sandstone, tuff or granite in Paleozoic and Mesozoic. The coastal corridors are tortuous and changeable, forming a hidden situation of "big bay with small bay" in coastal waters. The main harbors are Chimney Bay, Xunliao Port, Fanhe Port, Aotou Port, Xiaogui Bay and Dapeng 'ao. There are many islands in the bay, including port islands, central islands, Lajia islands and Tuoning islands in the northwest and middle.

Daya Bay is one of the most excellent bays along the coast of Guangdong Province, among which Dapeng 'ao has the best natural conditions and no siltation, and is an excellent port site for building a large-scale deep-water wharf. Rich in aquatic products, it is a breeding reserve for aquatic resources in China.