Situated on the south-west side of Halong Bay, Ba Ham Lake is found on A?au Be Island (Calf Head Island) in Lan Ha Bay. This island is part of the range of islands at the farthest end of Halong Bay, bordering the immense zone Long Chau Sea.
Ba Ham Lake is situated in the middle of a narrow, rectangular area, with the all four sides enclosed by vertical cliffs.Ai??The lake is a system comprising three wide and round pits, linked together by a narrow and meandering tunnel. Stalacti
tes hang from the ceiling in a myriad of strange, coloured forms. The silence is disturbed only by the sounds of the boatai??i??s oars. On the island are many species of plants such as orchids, benjamin figs, banyans and cycads, which blossom throughout the year. It is also the home of yellow-haired monkeys, birds, flying squirrels and bats. Under the deep blue surface of the water are the animated lives of shrimp and fish.
Although 25 km from the shore, it has long been considered an ideal tourism zone. The entrance is a open semi-circular hole in the flat stone wall on the north-west side of the island, 4 to 5 m above the sea.