The karst formation of Phong Nha-Ke Bang National Park has evolved since the Paleozoic (some 400 million years ago) and so is the oldest major karst area in Asia. Subject to massive tectonic changes, the park’s karst landscape is extremely complex with many geomorphic features of considerable significance. The vast area, extending to the border of the Lao People’s Democratic Republic, contains spectacular formations including 65 kilometers of caves and underground rivers.
Discover the best top things to do in Quang Binh Province, Vietnam including Tu Lan Caving Center, Son Doong Cave, Ruc Mon Cave, Phong Nha Caves, Paradise Cave, Tien Son Cave, Hang Toi (Dark Cave), Survival Valley.
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