Puerto Princesa

The Puerto Princesa Underground River is a limestone cave system located within the Puerto Princesa Subterranean River National Park on the island of Palawan in the Philippines. It is famous for its underground river that flows directly into the sea and is recognized by UNESCO for its outstanding biodiversity and unique geological formations.

Introduction to Puerto Princesa

Geology and Formation

The underground river was formed over millions of years through the erosion of limestone mountains. It flows through a vast karst landscape filled with stalactites, stalagmites, and large cave chambers. The river’s underground channel connects directly to the West Philippine Sea, creating a rare mix of freshwater and tidal influences within the cave ecosystem.

Biodiversity and Ecosystem

The surrounding national park contains one of the most well-preserved old-growth forests in the Philippines. It is home to a variety of wildlife, including the Palawan hornbill, monitor lizards, bats, and swiftlets that nest along the cave ceilings. The river’s estuarine environment also supports a rich mix of both terrestrial and marine species, making it an important ecological habitat.

Tourism and Conservation

Recognized as one of the New7Wonders of Nature, the site attracts thousands of visitors each year for guided paddleboat tours through the cave. Access is carefully regulated to protect its fragile ecosystem and wildlife. Ongoing conservation efforts focus on minimizing human impact, preventing pollution, and preserving the natural integrity of the Puerto Princesa Subterranean River National Park.