Puerto Princesa Underground River


Entrance to the underground river in Puerto Princesa, Palawan, Philippines.


Officially called Puerto Princesa Subterranean River National Park, the underground river  is about 8.2 kilometers in length within a 24-kilometer cave system. It was declared a UNESCO World Heritage site in 1999. It was also voted as one of the Seven New Wonders of Nature in 2012. 

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