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This isPalawan

Puerto Princesa, Puerto Princesa

Puerto Princesa Subterranean River National Park

The park protects a limestone karst landscape in the Saint Paul Mountain Range on Palawan's west coast, inscribed by UNESCO as a World Heritage Site in 1999.

Its centerpiece is an 8.2-kilometre underground river, one of the longest navigable cave rivers known. The lower stretch is brackish and tidal, since the cave opens directly onto the sea through a cliff face half submerged in a saltwater lagoon.

Visitors paddle in on a small boat with a guide and a headlamp, passing chambers of stalactites and stalagmites; only a portion of the full river length is open to tourism, with the rest reserved for research and conservation.

The cave mouth of the underground river below a forested limestone cliff, Puerto Princesa Subterranean River National Park
Photo: David Milmont, via Unsplash, Unsplash License

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Sources (3)Last checked 21 Oct 2026