underground river
Cave's flowing water
An underground river is a natural watercourse that flows beneath the earth's surface, typically through caves, caverns, or porous rock formations like limestone.
Some emerge as springs; others remain entirely hidden.
The tour took us to see the underground river that carved out these caves over millions of years.
- caveUnderground hollow in rock
- cave systemInterconnected underground passages
- cenoteLimestone sinkhole revealing groundwater
- sinkholeUnderground collapse crater
- karstEroded soluble rock terrain
stalactite · limestone · water source · spring · aquifer · dissolution · spelunking · water extraction · endemic species · resurgence · cave diving · water table · grotto · tunnel · passage · subterranean · dripping · current
- cavescave, cavern, caves, caverns, grotto
- habitatsforest, ocean, lake, pond, desert
- natural water sourcesspring, waterfall, creek, brook, pond
- undergroundsubterranean, cave systems, tunnels, tunnel, tube
- water sourceslake, rain, well, pond, stream
- Mammoth CaveMammoth Cave, cave entrance, cave tours, stalactites, stalagmites