Incredible mysteries in the Philippines' most famous national park.

Puerto Princesa, a World Heritage Site, boasts a vast network of limestone caves and a unique underground river.

Located on Palawan Island, the Puerto Princesa Underground River National Park is considered one of the most biodiverse areas in the Philippines. Photo: Pinterest.

Puerto Princesa boasts a kilometer-long underground river. Flowing through limestone caves and emptying into the sea, this is a distinctive feature of the island. Photo: Pinterest.

The cave system was formed millions of years ago. Karst processes created a spectacular landscape with a large-scale cave system. Photo: Pinterest.

Home to many endemic plant and animal species, the flora and fauna of Puerto Princesa Underground River National Park are diverse and unique, with many species found only in this area. Photo: Pinterest.

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The area boasts a rich mangrove ecosystem. The estuary region within the national park is an important habitat for many animal species. Photo: Pinterest.

A popular ecotourism destination, boat tours through the caves are a highlight of the experience visitors can enjoy at Puerto Princesa Underground River National Park. Photo: Pinterest.

Playing a vital role in nature conservation, this national park is particularly important in protecting the coastal ecosystem of Palawan. Photo: Pinterest.

As a UNESCO World Natural Heritage Site, this designation recognizes the outstanding geological and biological value of Puerto Princesa Underground River National Park. Photo: Pinterest.

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