A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely at the end of its course, and does not reach another body of water. Small rivers may be called by several other names, including stream, creek, brook, rivulet, and rill. There are no official definitions for generic terms, such as river, as applied to geographic features, although in some countries or communities a stream may be defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague.
Rivers are part of the hydrological cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks (e.g. from glaciers). Potamology is the scientific study of rivers while limnology is the study of inland waters in general.
No extraterrestrial rivers are currently known, though large flows of hydrocarbons described as rivers have recently been found on Titan. Channels may indicate past rivers on other planets, specifically outflow channels on Mars and are theorised to exist on planets and moons in habitable zones of stars.
Read more about River: Topography, Classification, Uses, Ecosystem, Chemistry, Brackish Water, Flooding, Sediment Yield, Management, See Also
Famous quotes containing the word river:
“But not luck
brought us here. By design
clear air and cold wind polish
the river lights, by design
we are to live now in a new place.”
—Denise Levertov (b. 1923)
“I cannot tell how many times we had to walk on account of falls or rapids. We were expecting all the while that the river would take a final leap and get to smooth water, but there was no improvement this forenoon.”
—Henry David Thoreau (18171862)
“Come, heart, where hill is heaped upon hill:
For there the mystical brotherhood
Of sun and moon and hollow and wood
And river and stream work out their will....”
—William Butler Yeats (18651939)