Natural Examples
There are many natural examples of subterranean rivers. Among others:
- The Križna cave system in Loška dolina, Slovenia includes 22 subterranean lakes
- The Lost River in the Appalachian Mountains of West Virginia disappears underground and reappears as the Cacapon River
- The Mojave River in southern California flows underground in most places
- The Phong Nha-Ke Bang National Park in Vietnam has an underground river flowing through its cave system
- The Puerto Princesa Subterranean River on the island of Palawan, Philippines flows underground before emerging into the South China Sea
- The Santa Fe River in northern Florida drops into a large sinkhole in O'Leno State Park and reappears in the adjacent River Rise Preserve State Park, 3 miles (4.8 km) downstream
- The Sistema Sac Actun is an underwater cave system near the Caribbean coast of the Yucatan Peninsula
- The Río Secreto system of caves, formed over centuries by an underground river is located in the Riviera Maya, Yucatan Peninsula.
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—Henry David Thoreau (1817–1862)
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