Is a UNESCO World Heritage Site and a popular travel destination, located in Quang Ninh province in Vietnam. The bay features thousands of limestone karsts and isles in various sizes and shapes. It has an area of around 1,553 km2, including 1,960 islets, most of which are limestone. The core of the bay has an area of 334 km2 with a high density of 775 islets. The limestone in this bay has gone through 500 million years of formation in different conditions and environments. The evolution of the karst has taken 20 million years under the impact of the tropical wet climate.
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