Category Archives: Where to go

PPUR: Longest underground river system

Puerto Princesa Underground River

The world’s longest underground river system accessible to man can be found at the St. Paul National Park in the province of Palawan. It is 8 kilometers long. (Photo: OP-PCSD)

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PPUR: Longest underground river system

Puerto Princesa Underground River

The world’s longest underground river system accessible to man can be found at the St. Paul National Park in the province of Palawan. It is 8 kilometers long. (Photo: OP-PCSD)