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HạLong Bay(descending dragon bay) is a UNESCO World Heritage Site and a popular travel destination in Quảng Ninh Province. It features thousands of limestone karsts and isles in various sizes and shapes.

HạLong Bay has an area of around 1,553 km and consists of a dense cluster of some 1,600 limestone monolithic islands each topped with thick jungle vegetation rising spectacularly from the ocean. Several of the islands are hollow, with enormous caves and beautiful beaches. Another specific feature of Halong Bay is the abundance of lakes inside the islands.

The limestone in the bay has gone through 500 million years of formation in different conditions and environments. The evolution of the karst (a landscape formed from the dissolution of soluble rocks)  in the bay has taken 20 million years under the impact of the tropical wet climate. The geo-diversity of the environment in the area has created great biodiversity, including a tropical evergreen biosystem, oceanic and sea shore biosystem. The bay is home to14 endemic floral species and 60 endemic fauna species. Historical research surveys have shown the presence of prehistoric human beings in this area tens of thousands years ago and many artefacts have been found there. About 1,600 people live on the bay in four fishing villages. Birds and animals including bantams, antelopes, monkeys, and lizards also live on some of the islands.