HA LONG BAY (Vietnam)
Meaning "descending dragon," this bay features thousands of limestone karsts and isles in various shapes and sizes, the result of 20 million years of geological evolution. A famous Vietnamese poet called it "rock wonder in the sky." During the Vietnam War, the US Navy placed mines between some islands, some of which continue to pose a threat to shipping.
(Image courtesy Wikimedia Commons; CTTO)
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