Underground Stream

Subterranean river

A subterranean river is a river or watercourse that runs wholly or partly beneath the ground, one where the riverbed does not represent the surface of the Earth. It is distinct from an aquifer, which may flow like a river but is contained within a permeable layer of rock or other unconsolidated materials. A river flowing below ground level in an open gorge is not classed as subterranean.

Stream

A stream is a continuous body of surface water flowing within the bed and banks of a channel. The channel is a watercourse, although the watercourse may be seasonally or periodically dry. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. A long, large stream is usually called a river, while a smaller, less voluminous, and more intermittent stream is known as a creek or tributary, among other names.

underground

Adjective

1. Below the ground; below the surface of the Earth.
2. Hidden, furtive, secretive.

Adverb

1. Below the ground.
2. Secretly.

stream

Noun

1. A small river; a large creek; a body of moving water confined by banks.
2. All moving waters.

Verb

1. To flow in a continuous or steady manner, like a liquid.
2. To extend; to stretch out with a wavy motion; to float in the wind.