Ha Long Bay is located in the northeast corner of Viet Nam, 165 km from Ha Noi. In the Province of Quang Ninh. Ha Long Bay covers an area of 1,553 km2 with 1,969 islands, of which 90% are limestone islands. To the west and north west, Ha Long Bay stretches from Yen Hung district in Ha Long city to Cam Pha town in Van Don district; to the south-east and in the south, Ha Long Bay borders the western shore of Tonkin Gulf; to the southwest the Bay borders Cat Ba island