Halong 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 thousand of large and small islands, creates areas of water with an average and stable of sea level. Meanwhile, the climate in Halong bay is also stable, with an average temperature of between 19 to 25 and an average heat radiation rate of 17 kcal/sq. cm/month. it see an average rainfall of 2,000 to 2,200 mm/a year. these favourable condition has seen the development of many varied ecosystems.
Results of scientific research show that Halong bay features ecosystems of a tropical ocean region, such as ; saltwater-flooded forests, coral reefs and tropical rain forests.
In the sea surrounding Halong, coral grow in many places, but is densely concentrated on the eastern and southern sides, fer from the main land.
The coral forests of Halong are a wonderful sight, with many extraordinary shapes and diversified colours. When the tide flows, the coral moves with the water, pumping as rhythmically as a heartbeat. At the same time, the reefs are residence to a great number of species; fish (107 verities), water plants, algae and transitory animals and plants.
The salt water – flooded forests also offer especially interesting scenery along the coastline of Halong bay. These forests are chiefly concentrated in the zones of Tuan Chau, Cua luc and Ba che. Many species of salt water – flooded plants, the most diversified collection in the north Vietnam are found here.
The tropical rain forest ecosystem also features a rich quantity of species. This is the residence of various rare and precious creatures; deer, weasels,squirrels and in particular, white – tabby and red haired monkeys. At the same time, these is a systems of small cave along the sea, Which are the living and development places for many animals and plants sea weed, water plants,algae, fish and shrimp. Deeper in to the water, there are also many species of shrimps and fish(almost 1,000 species),abalone and other sea specialities.

• Halong Bay information
• Halong Bay grottoes and caves system
• Halong Bay Culture and History value
• Halong Bay The values of Biological diversity
• Halong Bay island system
• Halong Bay Travel guide
• Halong Bay weather
• Quang Ninh Province information
• Halong Bay Travel Map

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