Hon Gai (now part of Ha Long City) is part of the capital city of Quang Ninh Province. The city mainly lies on Bai Tu Long Bay, which adjoins Ha Long Bay. It is located at about 160 km northeast of Hanoi. Hong Gai has long been the main source of surface coal in Vietnam, and its strip mines, especially during the colonial period, were infamous for their hard conditions approaching near slave labour. Ha Long city is divided into two parts: East Ha Long and West Ha Long. The eastern part (Hon Gai), where most of the official buildings and industry are concentrated, is connected by bridge with the western part (Bai Chay), considered to be more of a tourism attraction. Hon Gai remains gritty and dominated by coal.