Portal:Rivers
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Introduction

A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of 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).
Rivers and streams are often considered major features within a landscape; however, they actually only cover around 0.1% of the land on Earth. They are made more obvious and significant to humans since many human cities and civilizations are built around the freshwater supplied by rivers and streams. Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, and as a means of disposing of waste. (Full article...)
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The Ombla is a short river in Croatia, northeast of Dubrovnik. Its course is approximately 30 metres (98 feet) long, and it empties into the Rijeka Dubrovačka, ria formed by the Adriatic Sea near Komolac in Dubrovnik-Neretva County. Rijeka Dubrovačka is actually a ria, a flooded river valley formed through changes in sea surface elevation on a geologic time scale. The river rises as a karst spring fed by groundwater replenished by Trebišnjica, which is an influent stream flowing in Popovo Polje, in the immediate hinterland of the Ombla. The elevation difference between the river's source and its mouth is just over 2 metres (6 feet 7 inches). The average discharge of the river is 24.1 cubic metres (850 cubic feet) per second. The drainage basin of the Ombla encompasses 600 square kilometres (230 square miles) and, besides the short surface course, includes only groundwater flow.
The Ombla is used as a source of drinking water for Dubrovnik's water supply network, and construction of a hydroelectric power plant has been planned for the past two decades. , the plans entail construction of a subsurface reservoir and a 68 megawatt power plant. The plan sparked controversy amid doubts raised with respect to environmental protection and biodiversity management, technical and financial feasibility, and procedural problems related to the project. A particular concern expressed was that the underground reservoir might trigger earthquakes. (Full article...)Selected Quote
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Gran Valira river spanned by the Pont de la Margineda in Andorra
General images -
Did you know?
- ... that the River Poddle, the main water source of the city of Dublin for over 500 years, was later so polluted by industry that it allegedly killed cattle and horses drinking from it?
- ... that six different dams were proposed for the lower Sanpoil River?
- ... that radio station WWBC in Cocoa, Florida, was forced to remove its transmitter tower from the Indian River when the site was sold to condominium developers?
Related portals
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Featured articles
Aliso Creek (Orange County)
Balch Creek
Big Butte Creek
Bull Run River (Oregon)
Chetco River
Colorado River
Columbia River
Columbia Slough
Fanno Creek
Johnson Creek (Willamette River tributary)
Jordan River (Utah)
Larrys Creek
Little Butte Creek
Plunketts Creek (Loyalsock Creek tributary)
River Parrett
Rogue River (Oregon)
St. Johns River
Tryon Creek
Waterfalls in Ricketts Glen State Park
White Deer Hole Creek
Willamette River
Featured lists
List of longest rivers of the United States (by main stem)
List of longest streams of Idaho
List of longest streams of Oregon
List of tributaries of Bowman Creek
List of tributaries of Catawissa Creek
List of tributaries of Larrys Creek
List of tributaries of Mahanoy Creek
List of tributaries of Shamokin Creek
Good articles
Abrahams Creek
Adams River (British Columbia)
River Avon, Bristol
Big Wapwallopen Creek
Black Creek (Susquehanna River tributary)
Briar Creek (Susquehanna River tributary)
Buffalo Creek (West Branch Susquehanna River tributary)
Canajoharie Creek
Catawissa Creek
Celilo Falls
Cem (river)
Cibolo Creek
Covering of the Senne
Darby Creek (Pennsylvania)
Eddy Creek (Lackawanna River tributary)
Esopus Creek
Estuaries of Texas
Everglades
Fishing Creek (North Branch Susquehanna River tributary)
Flushing River
Fonteyn Kill
Fossil Creek
River Frome, Bristol
Gowanus Canal
Great Zab
Hammersley Fork
Harveys Creek
Hudson River
Hull Creek (Lackawanna River tributary)
River Hull
Hunlock Creek
River Irwell
Islais Creek
Ithan Creek
Jiloca (river)
Kaweah River
Kettle Creek (Pennsylvania)
Keyser Creek
Kings River (California)
Kissena Creek
Klamath River
Kootenay River
Laguna Canyon
Leggetts Creek
Little Applegate River
Little Catawissa Creek
Little Fishing Creek
Little Wapwallopen Creek
Mahanoy Creek
Mahoning Creek (Susquehanna River tributary)
Meadow Brook (Lackawanna River tributary)
Merced River
Messers Run
Minetta Creek
Minnehaha Park (Minneapolis)
Missouri River
Moston Brook
Mud Creek (Chillisquaque Creek tributary)
Muncy Creek
Nanticoke Creek
Neepaulakating Creek
Nescopeck Creek
Ombla
Petitcodiac River
Potlatch River
River Arun
River Brue
River Tone
River Torrens
River Weaver
Roaring Brook (Lackawanna River tributary)
Roaring Creek (Pennsylvania)
River Rother, East Sussex
River Rother, West Sussex
San Juan Creek
Santa Ana River
Sava
Saw Mill River
Scotch Run (Catawissa Creek tributary)
Severn bore
Shickshinny Creek
Shimna River
Shinano River
Snake River
Solomon Creek
Spring Brook (Lackawanna River tributary)
Stafford Meadow Brook
Stanislaus River
Stony Brook (Charles River tributary, Boston)
Sulphur Creek (California)
Tangascootack Creek
Toby Creek
Trinity River (California)
River Trym
Twomile Run
Wainui Falls
River Welland
West Branch Fishing Creek
West Creek (Pennsylvania)
West Kill
River Witham
Yellala Falls
Zarqa River
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Associated Wikimedia
Portals
Media files used on this page
Author/Creator: Kmusser, Licence: CC BY-SA 3.0
Map of the Amazon River drainage basin with the Amazon River highlighted.
"The Blue Marble" is a famous photograph of the Earth taken on December 7, 1972 by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometers (18,000 statute miles). It shows Africa, Antarctica, and the Arabian Peninsula.
Author/Creator: Frank Vincentz, Licence: CC-BY-SA-3.0
Aegopodium podagraria
Author/Creator: Buaidh, Licence: CC BY-SA 4.0
Walden Pond, Massachusetts on June 27, 2012. This is a square crop of

Author/Creator: Buaidh, Licence: CC BY-SA 4.0
The Matterhorn as seen from Zermatt. This is a square crop of

Author/Creator: Brocken Inaglory, Licence: CC BY-SA 4.0
Sea Storm in Pacifica, w:California
Author/Creator: Photo taken by de:Benutzer:Alex Anlicker using a Nikon Coolpix 950., Licence: CC-BY-SA-3.0
Pitná voda - kohoutek
Author/Creator: Michael Jastremski, Licence: CC BY-SA 2.0
Cumulus clouds in fair weather. Photograph taken by Michael Jastremski.
A scene in the Atchafalaya Basin in Louisiana, USA, in the Sherburne Complex Wildlife Management Area, a Nature Conservancy reserve.
"The Blue Marble" is a famous photograph of the Earth taken on December 7, 1972, by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometres (18,000 mi). It shows Africa, Antarctica, and the Arabian Peninsula.
Author/Creator:
penubag (color adjustments)
, Licence: PDAn i icon for templates and the like
(c) Carpenter0 at English Wikipedia, CC BY-SA 3.0
Waitakere ranges New Zealand long fin eel (Anguilla dieffenbachii) by David Burgess
Author/Creator: Spandan chowdhury, Licence: CC BY-SA 4.0
a wild river,, flowing silently, amidst the deep jungles and Mountains of Himalaya
Author/Creator: David R. Bridgland, Jef Vandenberghe and Xianyan Wang. Figure designed and drafted by Meredith Sadler., Licence: CC BY-SA 4.0
Schematic diagram to show range of anthropogenic influences on river systems. Illustrated examples are mainly from settings with modest technological influence, especially in the period of about 10,000 to 4000 cal yr BP.
Author/Creator: Tarquin Binary, Licence: CC BY-SA 2.5
Effra former stream, since mid-19th century combined fully underground (culverted) sewer has a storm outlet pending construction of the Thames Tideway Tunnel, Vauxhall, London. 29 October 2005. Photographer: Fin Fahey
Author/Creator: Fredlyfish4, Licence: CC BY-SA 3.0
Interstate 20 crossing the Mississippi River at Vicksburg, Mississippi.
(c) Christian Fischer, CC BY-SA 3.0
Canadian Waterweed, Elodea canadensis (with enlarged cross section of a single whorl). In this instance, the leaves are relatively long and narrow (four times longer than wide). There are also specimens with stockier leaves.
The Castle Geyser, Upper Geyser Basin, Yellowstone National Park from Hayden, Ferdinand Vandeveer (1829-1887), The Yellowstone National Park and the mountain region of portions of Idaho, Nevada, Colorado and Utah... (Boston: lithograph by L. Prang, 1876)
Author/Creator: Jean Michel Etchecolonea, Licence: CC BY-SA 3.0
Cascade à Gabas (Pyrénées-Atlantiques) (Pyrénées).
A forest winter scene near Erzhausen, Germany. Looking eastwards.
Author/Creator: Y. Drasil, Licence: CC BY-SA 3.0
l'entrée de la gorge du Diable sur la route de Trigrad en Bulgarie.
Author/Creator: Kestin Schulz, Mariya W. Smit, Lydie Herfort and Holly M. Simon. The image (amended) was provided courtesy of the Missouri Department of Conservation., Licence: CC BY-SA 4.0
Example of an aquatic food web
Bacteria can be seen in the red box at the bottom. Bacteria (and other decomposers, like worms) decompose and recycle nutrients back to the habitat, which is shown by the light blue arrows. Without bacteria, the rest of the food web would starve, because there would not be enough nutrients for the animals higher up in the food web. The dark orange arrows show how some animals consume others in the food web. For example, lobsters may be eaten by humans. The dark blue arrows represent one complete food chain, beginning with the consumption of algae by the “water flea” Daphnia, which is consumed by a small fish, which is consumed by a larger fish, which is at the end consumed by the Great blue heron.
Author/Creator: Jeffrey Horvath from columbus /// chicago, USA, Licence: CC BY 2.0
Photo of the Walhalla ravine in the Clintonville area of Columbus, Ohio.
Common water hyacinth (Eichhornia crassipes)
Author/Creator: unknown, Licence:
Author/Creator: The original uploader was Aonrotar at English Wikipedia., Licence: CC-BY-SA-3.0
A weir on the River Calder, taken by Harry Wheildon on 24th March, 2007.
Author/Creator: Yang Liu, Xiaodong Qu, James J. Elser, Wenqi Peng, Min Zhang, Ze Ren, Haiping Zhang, Yuhang Zhang and Hua Yang, Licence: CC BY-SA 4.0
Co-occurrence networks of bacterial communities in a stream
Author/Creator: Paul Chin, Licence: CC BY-SA 2.0
Puerto Princesa Subterranean River, Philippines: View of the cave's entrance
(c) Simon Fieldhouse, CC BY-SA 3.0
Drawing of T. S. Eliot by Simon Fieldhouse.
Author/Creator: Alexrk2, Licence: CC BY-SA 3.0
Map icons for Wikipedia markers
(c) Diego Delso, CC BY-SA 4.0
This is a photo of a heritage property registered in the General Inventory of Cultural Heritage of Andorra
Gustave Doré's illustration to Dante's Inferno. Plate IX: Canto III: Arrival of Charon. "And lo! towards us coming in a boat / An old man, hoary with the hair of eld, / Crying: 'Woe unto you, ye souls depraved!'" (Longfellow's translation) "And, lo! toward us in a bark / Comes an old man, hoary white with eld, / Crying "Woe to you, wicked spirits!" (Cary's translation)
Author/Creator: Sergi Sabater, Xisca Timoner, Carles Borrego and Vicenç Acuña, Licence: CC BY-SA 4.0
An idealized scheme of the biofilm components in streams
The different biofilm components (algae and bacteria, as the principals) are embedded in an exopolysaccharide matrix (EPS), and are net receptors of inorganic and organic elements and remain submitted to the influences of the different environmental factors.
Author/Creator: inajeep from US, Licence: CC BY 2.0
stream in the redwoods: stream in Muir Woods