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A river is a natural freshwater stream that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river ...
This stream operating together with its environment can be thought of as forming a river ecosystem. River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.
The River Ribble has the third-largest tides in England, with tides that run at 4 knots (5 mph; 7 km/h) and a tidal range at the mouth of the river of 30 feet (9 m) during spring tides. Since River Ribble dredging ceased, the estuary is filling up with sand and is developing a meandering path, depending on the tides and river runoff.
Johnson Creek is a 25-mile (40 km) tributary of the Willamette River in the Portland metropolitan area of the U.S. state of Oregon.Part of the drainage basin of the Columbia River, its catchment consists of 54 square miles (140 km 2) of mostly urban land occupied by about 180,000 people as of 2012.
The dead zone at the outlet of the Mississippi River is a consequence of nitrates from fertilizer being carried off agricultural fields and funnelled down the river system to the Gulf of Mexico. Runoff also plays a part in the carbon cycle , again through the transport of eroded rock and soil.
River ecosystems are prime examples of lotic ecosystems. Lotic refers to flowing water, from the Latin lotus, meaning washed. Lotic waters range from springs only a few centimeters wide to major rivers kilometers in width. [16] Much of this article applies to lotic ecosystems in general, including related lotic systems such as streams and springs.
A stone near Crissolo, Italy, is inscribed, "Here is born the Po".. The United States Geological Survey (USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream".
By the Middle Ages the river was known as the river of Arundel, the Arundel river, or the high stream of Arundel. An alternative name, the Tarrant (derived from Trisantona), is, however, attested in 725 and 1270, and is reflected in the road name Tarrant Street, one of the main roads running through the town roughly parallel to the river. The ...