This is the "PUERTO PRINCESA UNDERGROUND RIVER " 1 of the most 7 wonders in the world.
The park has a limestone karst mountain landscape. St. Pauls Underground River Cave is more than 24 km (15 mi) long and contains an 8.2 km (5.1 mi) long underground section of the Cabayugan River. The river winds through the cave before flowing directly into the West Philippine Sea.
UNESCO declared it as WORLD HERITAGE SITE
Birds comprise the largest group of vertebrates found in the park. Of the 252 bird species known to occur in Palawan, a total of 165 species of birds were recorded in the park. This represents 67% of the total birds and all of the 15 endemic bird species of Palawan.