The Puerto Princesa Subterranean River National Park is one of the most important conservation areas in the country, the main focus of which is the remarkable 8.2 km long underground river that flows beneath a spectacular limestone formation before emptying into St. Paul Bay.

The underground river is easily navigable up to 4.3 km and is reputed to be the longest navigable underground river in the world.

Trained park personnel operate paddle boats that take visitors on a 45 minute tour of the cave, allowing them to appreciate the different rock formations as well as the thousands of bats and swiftlets that inhabit the cave.

To regulate visitor access and uphold the designated carrying capacity of the Underground River, a strict “No Permit, No Entry” policy is enforced by park management. All visitors are required to secure a Visitor Entry Permit at the booking office prior to entering the Park.

Also located at the Park Visitor Center is the Ethnographic Museum, which features exhibits detailing the history and culture of the Batak and Tagbanua, two indigenous cultural groups residing within the Park. Briefings and printed information could also be availed at the center.

The Subterranean River National Park is listed as a UNESCO World Heritage Site, designated as a National Geological Monument, and celebrated as one of the New Seven Wonders of Nature.