Ha Long Bay was twice recognised as a UNESCO World Heritage Site in 1994 and 2000 (Photo VNA) 
Most of the rocks in Ha Long Bay are limestone islands (Photo VNA) 
Ha Long Bay has a total area of 1,553 square kilometres, including 1,969 large and small islands, of which 989 are named (Photo VNA) 
Ha Long Bay is located in the North East of Vietnam (Photo VNA) 
A corner of Ha Long Bay (Photo VNA) 
Way to Thien Cung cave (Photo VNA) 
Inside a cave (Photo VNA) 
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Together with the neighbouring Bai Tu Long Bay, they form a tourism complex with thousands of islands, considered among the most valuable biological and geographical assets of the country and the world (Photo VNA) VNA
