UNESCO says:
Ha Long Bay, in the Gulf of Tonkin, includes some 1,600 islands and islets, forming a spectacular seascape of limestone pillars. Because of their precipitous nature, most of the islands are uninhabited and unaffected by a human presence. The site's outstanding scenic beauty is complemented by its great biological interest.
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UNESCO world heritage site

Suni says:
Wonderful array of limestone pillars in the sea, mostly uninhabited, and thereby containing interesting flora & fauna. Where Goldfinger ws filmed.