Sousa, the Chinese white dolphin (locally called the Matsu's fish) that was previously considered to be a subspecies of the Indo-Pacific humpback dolphin, lives in the waters off southern China including Wanshan Archipelago, Nanji Islands, the Pearl River Delta, and Hong Kong, Gulf of Tonkin Hainan Island such as around Sanya Bay, Leizhou Peninsula, Paracel Islands, and on Penghu Islands to along western coasts of Taiwan, mainland coasts along Formosa Strait such as at Xiamen and Xiapu County, and Marine Sanctuary in Nan'ao County, and dolphin sanctuary in Qingzhou. The Chinese white dolphin is a symbol of Hong Kong, and special sanctuary has been declared to protect the species with approaches to co-exist with sustainable dolphin watching, although the local population is in serious peril.