Gold Street on the National Coast. Haitang Bay is located in the northeast coast of Sanya City, Hainan Province, and Sanya Haitang Bay Jewelry Gold Street Project is located in the National Coast Gold Street. Sanya, a prefecture-level city in Hainan Province, is called Cliff for short and Yazhou in ancient times, also known as Lucheng, which is located at the southernmost tip of Hainan Island. Located at the southern tip of Hainan Island, it is adjacent to Lingshui County in the east, Ledong County in the west, Baoting County in the north and Nanhai in the south.