The exactly geographical position is in a rectangle between 20°55'05" and 21°15'10" North latitude, 107°30'10" and 107°46'20" East longitude. It administratively consists of 3 communes: Minh Châu, Vạn Yên and Hạ Long of Vân Đồn District.

It is composed from a terrestrial area of 61.25 km2 and an aquatic area of 96.58 km2. The zone includes over 40 islands and rocks. They form three groups : Ba Mùn group, Trà Ngọ group and Sậu group. The aquatic area includes the sea zone between the islands and the narrows between the park area and the land area which has boundary of 1 km offshore. The National Park also includes a buffer zone of approximately 165.34 km2, which is located in a larger area including 5 communes : Minh Châu, Vạn Yên, Bản Sen, Quan Lạn and Hạ Long. The total population of the core zone and the buffer zone is around 24.000.