Puerto Princesa Underground River

The 8.2 km-long (5 mile) Puerto Princesa Subterranean River National Park was listed as a UNESCO World Heritage Site on December 4, 1999, for its ecological value, and features a limestone formation containing an underground river that is reputed to be the longest navigable underground river in the world.
Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

Puerto Princesa Underground River

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