World's Longest Accessible Underground River

The World's longest accessible underground river system is found in the St. Paul National Park on Palawan Island, approximately 50-km North-northeast of Puerto Princesa. The St. Paul Subterranean River is a submarine karst spring. It twists and turns for 8.2-km underground and features a full-mountain-to-sea ecosystem, a sweetwater-to-saltwater ecosystem plus a troglobitic ecosystem typical of underground rivers. This combination of habitats plus the dramatic stalactite and stalagmite formations makes the St. Paul Subterranean River so totally unique that it attracts biologists, ecologists, travellers and tourists from all around the World. The nearest airport to the St. Paul Subterranean River is located at Puerto Princesa.

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