Ha Long Bay is located in the northeastern part of Vietnam and constitutes part of the western bank of Bac Bo Gulf, including the sea area of Ha Long City and Cam Pha Town and part of Vân Don island district. It abuts Cat Ba Island in the southwest. Toward the west is the shore with a 120 km-long coastline. It is located within 106o58’-107o22’ east longitude and within 20o45’- 20o50’ north latitude. The