Phong Nha Cave
Vietnam
Adventure
Phong Nha Cave is a cave in Phong Nha-Kẻ Bàng National Park, a UNESCO World Heritage Site in Quảng Trị Province, Vietnam. It is 7,729 meters long and contains 14 grottoes, as well as a 13,969 meter underground river.
From Wikipedia, CC BY-SA 4.0
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