Deep underground on the island of Palawan in the Philippines lies the Puerto Princesa River. Both a UNESCO World Heritage Site and one of the ‘New 7 Wonders of Nature’, it’s the world’s longest navigable underground river and makes for an exciting experience in one of the Philippines’ most popular islands.
Here’s everything you need to know about exploring the Puerto Princesa Underground River.
Wait, an underground river? How is that possible?
Yep, that’s right. In fact, the river flows directly underneath the St Paul Mountain Range, found on the mid-western coast of Palawan. The river channeled its way through a series of vast chambers and caverns over millions of years ago.
The cave system stretches for a total of 24km underneath the mountains, and the river itself winds its way through 8.2km of it.