Underground River – Puerto Princesa, Palawan

 Underground River – Puerto Princesa, Palawan
The Puerto Princesa Subterranean River National Park (PPSRNP) is one of the most important biodiversity conservation areas of the Philippines. This underground river is one of the world's longest underground river and the previous record holder of the longest underground river in the whole world. The Park is a UNESCO World Heritage Site and home to diverse species of plants and animals.