Fun Facts About the Puerto Princesa Subterranean River
The Puerto Princesa Subterranean River, located beneath the Saint Paul Mountain Range on the island of Palawan in the Philippines, is one of the world's most remarkable navigable underground waterways. Flowing directly into Saint Paul Bay, the cave system functions as a subterranean estuary where ocean tides push saltwater more than four kilometers inland, causing water levels to fluctuate by roughly three feet each day. Because dense seawater slides beneath the freshwater draining from the surrounding mountain forest, the river forms a distinct, two-layered aquatic ecosystem separated by a…
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