Puerto Princesa Subterranean River National Park is located in the Philippines on the island of Palawan. This UNESCO World Heritage Site is famous for its stunning underground river, which stretches approximately 8.2 kilometers. The park features impressive limestone karst landscapes and diverse ecosystems, making it a vital area for biodiversity. The underground river flows directly into the South China Sea and is surrounded by lush tropical forests. Visitors can explore the river through guided boat tours, where they can witness unique rock formations and various wildlife species. The park is a popular destination for eco-tourism and conservation efforts.