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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.