Halong Bay is a body of water of approximately 1,500 square kilometres in north Vietnam with a 120 kilometre coastline, in the Gulf of Tonkin Gulf of Tonkin near the border with China, and 170 kilometres east of Hanoi. Ha Long Bay - means "Bay of the Descending Dragon" in the Vietnamese language.
The bay consists of a dense cluster of 3000 limestone monolithic islands, each topped with thick jungle vegetation, which rise spectacularly from the ocean. Several of the islands are hollow, with enormous caves. Hang Dau Go (Wooden stakes Cave) is the largest grotto in the Halong area. French tourists visited in the late 19th century, and named the cave Grotte des Merveilles. Its three large chambers contain large numerous stalactites and stalagmites (as well as 19th century French graffiti).
Some of the islands support floating villages of fishermen, who ply the shallow waters for 200 species of fish and 450 different kinds of mollusks. Many of the islands have acquired their names as a result of interpretation of their unusual shapes: such names include Voi Islet (elephant), Ga Choi Islet (fighting cock), and Mai Nha Islet (roof). 989 of the islands have been given names. Birds and animals including bantams, antelopes, monkeys, and iguanas also live on some of the islands.