It is one of the 7 wonders of nature and declared by UNESCO as World heritage site.
Puerto Princesa Underground River is also known as St Paul Subterenean river national park. It is where a river flows under a mountain range. It is a full mountain to the sea ecosystem.
You will enjoy a scenic boatride inside a cave past the towering limestones karst and walk through the national park where you can see monitor lizards, monkeys and other animals in thier natural habitat in the forest of sabang.