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Karsts are limestone landscapes formed over millions of years when slightly acidic rainwater dissolves soluble rock, producing steep towers, cliffs, caves, sinkholes, and underground rivers.

Tropical paradise of Cat Ba Island, Vietnam in Lan Ha & Ha Long Bay, southeast Asia.

Karst Landscape On Cat Ba Island In Halong Bay, Vietnam

A traveler cycles on a road surrounded by lush greenery, overlooking the tranquil waters of Halong Bay, Vietnam, at sunrise.

Cat Ba island in Vietnam. Green mountains with tropical rainforest

A large lake abutting the Cuc Phuong National Park supports an important fish farming industry

Ha Long Bay, limestone islands at Thanh pho Ha Long, Quang Ninh, Vietnam

A small island in the middle of a stone island on Ulleungdo

$Ha Long Bay in Quang Ninh Province features approximately 1,600 limestone karst islands and islets rising up to 200 meters from emerald waters across 1,553 square kilometers. These formations were created over 500 million years through tectonic uplift and erosion of limestone by rainwater and seawater. UNESCO designated it a World Heritage Site in 1994, recognizing its outstanding geological value. The name \$