Puerto Princesa Subterranean River National Park

Puerto Princesa Subterranean River National Park is a protected area in Cabayugan, about 76 km north of Puerto Princesa City in Palawan, Philippines. It features an 8.2-kilometer navigable underground river flowing through a limestone cave system directly into the West Philippine Sea. Inscribed as a UNESCO World Heritage Site in 1999, the park is noted for its karst landscape, intact old-growth forests, diverse ecosystems and impressive cave formations.

Visitors can expect a guided paddle-boat tour through a large limestone cave along the underground river. The tour passes through dark chambers with stalactites, stalagmites and large caverns, with an audio guide explaining formations. The park setting includes forested karst mountains, mangroves and a beach at Sabang wharf where boats depart. Wildlife such as monkeys, monitor lizards and birds may be seen in the surrounding forest and coastal area.