Ha Long Bay (also “Halong Bay”) is in northern Vietnam, 170 km (105 mi) east of Hanoi. The bay is famous for its scenic ocean karst topography and is often included in lists of natural wonders of the world. Ha long Bay is a bay located in the area of the Gulf of Tangkia, north of the Socialist Republic of Vietnam. It has an area of 1,500 square kilometers and has a coastline about 120 kilometers away from Hanoi. The name was based on the pronunciation in the Vietnam language “Viet Nam Ha Long”.
See In Ha long Bay, there are around 1969 limestone rising from the sea. On top of each island has a massive amount of trees. There are several large caves located within the island. The biggest cave in the Bay area is a wooden cave, formerly known as the Grotte des Island. The largest islands in the Bay area Gad bah Island and Tuan Chau Island. There are people living permanently in these islands. On these islands, there are many beaches and hotels serving the tourists. Some small island is the Habitat of several animal species, such as chickens, antelope, wild monkeys and species of lizards. These islands are named from the shape such as Koh Chang, Koh Kaichon, Koh Langka etc.
Source: Wiki Travel