Hạ Long Bay has a very complicated structure with its meandering coastline and many river mouths. Rich and diversified sources of food for many species of plants and animals are also found here. In particular, the bay, partitioned by thousands of large and small islands, creates areas of water with an average and stable sea level.

Hạ Long Bay covers a total area of 1,553 sq. km, including 1,969 islands of various sizes, 989 of which have been given names. There are two kinds, limestone and schist, which are concentrated in two main zones: the south-east (belonging to Bái Tử Long Bay), and the south-west (belonging to Hạ Long Bay). The average geological age of the islands is between 250 and 280 million years old.

The most remarkable geological events of Hạ Long Bay’s history in the last 1,000 years include the advance of the sea, the raising of the bay area and the strong erosion that has formed coral and pure blue and heavily salted water. This process of erosion by seawater has deeply engraved the stone, contributing to its fantastic beauty.

Situated in the North-East region of Vietnam, Halong Bay is a bay in the Gulf of Tonkin comprised of regions of Halong City, the township of Cam Pha, and a part of the island district of Van Don. Halong Bay borders Cat Ba Island in the southwest, the East Sea in the east, and the mainland, creating a 120 km coastline

Quang Ninh, because of its varied terrain, climate and soil, features a diversified and abundant environmental system.

The beauty of Hạ Long Bay consists in its mountains, water, clouds, caves and grottoes. Many, however, do not realise that Hạ Long was also the cradle of an ancient people who helped create the present Hạ Long culture.

Speaking of Hạ Long, one must above all talk of the beauty of its water and sky. In a relatively small area (1,553 sq. km), there are 1,969 islands rising from the sea