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http://originvietnam.com/wp-content/uploads/2009/04/halong-bay1.jpgHa Long Bay covers a total area of 1,553 sq,km, including 1,969 Islands and islets of various sizes, 989 of which which have been given names. There are two kinds, lime stone and schist, with are concentrated in two main zones; the south east ( belonging to Bai Tu Long Bay), and the South-West belonging to Halong Bay. The average geological age of the islands is between 250 and 280 million years old.
The densely concentrated zone of stone islands, grottoes and caves, World famous for its spectacular scenery, form the central zone of Halong Bay, wich have been listed as one of UNESCO’s World heritage sites. This protected site covers an area of 434 sq.km, coprises 775 islands anf forms a triagle; with the Daugo island (Drifwood island) to the west; The Baham lake(three shelter lakes) to the Sout; and the Cong Tay island to the East. The regions immediately surrouding the area were classified as the National site by th Ministry of cultureand information in 1962