On the south-east side of Ha Long Bay, Dau Be Island is 500 m from Hang Trai Island to the east, and 28 km from the Bai Chay Tourist Wharf, in an archipelago comprised between the Tra Nguyen Da Le islands outside Ha Long Bay (seaport of Lan Ha Bay).

It has an area of 22,863 sq. m, and its highest peak reaches 139 m. When speaking of the island, it is impossible not mention to Ba Ham Lake, a famous spot which people had known long time ago.