The Puerto Princesa Subterranean River National Park is a protected area located in the western part of the island of Palawan in the Philippines. It is home to the Puerto Princesa Underground River, a navigable river that flows through a limestone cave system. The river stretches for 8.2 kilometers and empties into the South China Sea.

The Puerto Princesa Underground River is a UNESCO World Heritage Site and is considered one of the New 7 Wonders of Nature. Visitors can take a guided tour on a paddleboat through the cave system to witness the impressive rock formations and the unique ecosystem that exists within the cave. The cave is home to a variety of flora and fauna, including several species of bats and birds.

The national park also features a dense forest that is home to a variety of wildlife, including the Philippine macaque, the Palawan bearded pig, and several species of birds. Visitors can go on a nature walk to explore the forest and learn about the various plant and animal species that call the park home.

The Puerto Princesa Subterranean River National Park is a popular tourist destination and is visited by thousands of people each year. It is an important conservation area and efforts are being made to preserve the unique ecosystem that exists within the park.