underground rivers
Cavern water systems
Underground rivers are streams of water that flow beneath the earth's surface, typically through cave systems, porous rock, or carved limestone channels.
They may surface as springs or remain entirely hidden.
The term also applies figuratively to hidden currents of influence or activity: There are underground rivers of money flowing through politics.
- stalactitesMineral deposits hanging downward
- karstEroded soluble rock terrain
- limestoneCarbonate sedimentary rock
- cave divingExploring underwater cavern systems
- sinkholesGround collapse cavities
aquifer · resurgence · cenote · lost river · dissolution · subterranean · speleology · spring · water source · percolation · cave · dark water · water extraction · infiltration · water table · hydrology · echoing · depths
- lost waterways
- cavescave, cavern, caves, caverns, grotto
- caves for childrenstalactites, stalagmites, bats, cave tours, darkness
- natural waterssprings, hot springs, streams, creeks, ponds
- undergroundsubterranean, cave systems, tunnels, tunnel, tube
- unexplored placesdeep sea, unmapped, undiscovered, deep ocean, uncharted
vertical position/visibility
underground riverssurface water
Water on land's exterior
rivers · creeks · brooks · streams · mountain streams