Subterranean river

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A subterranean river is a river that runs beneath the ground surface. These rivers can either be entirely natural, or a result of the deliberate installation of a culvert to channel a flow from the surface to underground, usually as a part of urban development.^{[citation needed]}

To reverse this process is known as daylighting a stream and is a visible form of river restoration. One successful example is the Cheonggye Stream in the centre of Seoul.

Examples of subterranean rivers include:

The River Fleet in London
The River Frome in Bristol
The Dommel underneath 's-Hertogenbosch in the Netherlands
The Lost River of West Virginia, which disappears underground and reappears as the Cacapon River
The Mojave River in southern California
The Palawan in Puerto Princesa Subterranean River National Park on the island of Palawan, Philippines
The Sac Actun system (named after the Mayan name of the larger of the two branches) in the Yucatán Peninsula is the result of a confirmed connection between two other rivers previously thought to be separate. Discovered by divers Robbie Schmittner and Steve Boagarts in January 2007, the full length is 153.6 kilometers long and a maximum depth of 72 meters underneath the surface.
The Santa Fe River in northern Florida
Son Trach river in Vietnam
The Zenne flowing underground through Brussels, following the covering of the Zenne

A flow somewhat similar to a subterranean river is a large body of moving water that exists in the Atlantic Ocean near the floor, part of the North Atlantic Current.^{[citation needed]}