Travel Bucketlist The Longest Underground River: Exploring Puerto Princesa River, Philippines Posted: March 22, 2025 | Last updated: March 22, 2025 Dive into the incredible underwater wonder of ...

Sistema Sac Actun (Mexico) – Located in the Yucatán Peninsula, it's one of the world’s longest underground rivers, connected to ancient Mayan cenotes. Lost River (USA – Indiana) – This river vanishes ...