sheer cliffs and a calm emerald river. puerto princesa subterranean river national park.

subterranean philippines vegetation reflection reservoir princesa national tropical emerald palawan cliffs puerto clouds nature sheer river green sandy shore coast water cliff ocean plant calm park blue tree rock sky bay turquoise water greenery tropic calm tree sand vegetation cliffs attraction tropical exotic unesco geologic rock karst geology turquoise steep lithic steep tourist destination unique underground river formation tourist limestone park palawan princesa tourism underground subterranean philippines nature landscape island green famous emerald coast cliff clear blue beautiful