Explorers Survey Forest-Filled Sinkhole in Phong Nha–Ke Bang
A survey documented a 2.1-hectare sinkhole and forest ecosystem within the protected national park.
Explorers have surveyed a 2.1-hectare sinkhole in a protected area of Phong Nha–Ke Bang National Park, documenting a forest ecosystem inside the limestone formation.
Nguyen Van Uy of Jungle Boss Tours first noticed a dark spot in satellite imagery in 2023. A team reached the opening in April 2025 after a difficult journey through the forest, and a larger expedition later surveyed the site, VnExpress International reported.
The survey put the oval opening at about 190 metres long and 140 metres wide. Inside, the sinkhole reaches an estimated 250 metres in length, 200 metres in width and 120 metres in depth. Its floor contains forest, landslide debris and accumulations of snail shells.
Park director Pham Hong Thai said the management would continue working with specialists to study the formation, its dimensions, geology and wildlife, including whether underground voids may exist.
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