The Puerto Princesa Subterranean River National Park is an 8.2 kilometer navigable underground river located in the province of Palawan in the Philippines. This Park is considered as a natural world heritage site and offers spectacular karst formations.
With its natural beauty, the Puerto Princesa Subterranean River National Park is truly a treasure to be kept and deserve to become one of the new 7 wonders of nature.  It also features major formations of stalactites and stalagmites and several large chambers. The river directly flows into the sea. The park has lush old growth tropical rainforest, undisturbed wildlife and natural scenery.
Puerto Princesa Subterranean River
The Puerto Princesa Subterranean River National Park has been declared as a National Geological Monument.