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Colorado River
Colorado River: 1,450-mile Southwest lifeline through seven U.S. states and 30 Tribal Nations to the Gulf of California; governed by the 1922 Compact and Law of the River, now in a 26-year drought with Lake Mead and Lake Powell at record lows and post-2026 operating guidelines set in 2026.
Colorado River (Texas)
Colorado River (Texas): largest river wholly within Texas, rising in Dawson County and flowing 600 miles to Matagorda Bay; managed by LCRA through the Highland Lakes, supplying Austin and Coastal Plain rice farms.
Columbia Glaciated
Columbia Glaciated (FEOW ecoregion 120) is a freshwater ecoregion covering the glaciated upper third of the Columbia River basin in British Columbia, Washington, Idaho, and Montana; temperate upland rivers, no endemic fish, snowmelt-dominated flows.
Columbia River
The Columbia River is the largest river of the Pacific Northwest, rising in Columbia Lake, British Columbia, and flowing about 1,942 km to the Pacific near Astoria, Oregon. Known for its ~260,000 sq mi basin, major dams (Bonneville, Grand Coulee), salmon fisheries, tribal treaty rights, and the 1964 Columbia River Treaty with Canada.
Columbia River drainage basin
The Columbia River drainage basin is the 669,000-square-kilometer watershed of the Columbia River across seven U.S. states and British Columbia, defined by snowmelt-driven runoff, 29 major federal dams, the 1964 Columbia River Treaty, and declining salmon runs.
Columbia Unglaciated
Columbia Unglaciated, FEOW freshwater ecoregion 121, is the never-glaciated lower two-thirds of the Columbia River basin in Oregon, Idaho, Washington, Nevada, and Montana, a Pleistocene refugium with endemic Oregon chub.
Colville (river)
Colville River (Kuukpik), largest river of Alaska's North Slope, flowing from the Brooks Range to a Beaufort Sea delta near Nuiqsut; ~60,000 km2 watershed, 290 m3/s mean discharge, Colville River Special Area.
Comoros - Mayotte
Comoros - Mayotte is a freshwater ecoregion covering the volcanic Comoros Islands in the Mozambique Channel, spanning about 2,171 km² across Grande Comore, Mohéli, Anjouan, and French Mayotte.
Confluence
River confluence: the junction where two or more rivers merge into one channel, also called a river junction. Key features include the confluence hydrodynamic zone, scour holes, mouth-bars, controls such as discharge ratio and junction angle, and confluence mobility.
Congo River
The Congo River, also known as the Zaire River, is the second largest river in the world by drainage area and discharge, behind only the Amazon.
Connecticut River
The Connecticut River is New England's longest river, over 410 miles from the Connecticut Lakes in New Hampshire through Vermont, Massachusetts, and Connecticut to Long Island Sound, with a 29,166 km² watershed.
Continental divide
A continental divide is a ridge or mountain crest that separates a continent's major watersheds, sending water on each side toward different oceans or seas.
Copper River (Alaska)
The Copper River is a glacial river in south-central Alaska, flowing about 290 miles from Mount Wrangell to the Gulf of Alaska and famed for its salmon runs.
Cuando
Cuando (Kwando) River: a 1,206 km south-central African river rising in the Angolan Highlands, flowing through Namibia and Botswana as the Linyanti and Chobe to join the Zambezi at Mambova Falls; basin over 156,000 km² shared by four countries.
Cuanza (landform)
The Cuanza River, also spelled Kwanza or Kuanza, is a river in Angola and the country's longest, rising on the Bié Plateau and reaching the Atlantic south of Luanda.
Cuito (landform)
Cuito (Kuito, Kwito) is a 920 km perennial river in southeastern Angola, the eastern headwater tributary of the Okavango River, flowing over deep Kalahari sands and providing steady dry-season baseflow to the Okavango Delta.
Cumberland River
The Cumberland River is a 688-mile Ohio River tributary rising at Harlan, Kentucky, looping through Nashville, Tennessee, and draining an 18,000-square-mile basin managed by nine Corps of Engineers dams for flood control, navigation, and hydropower.
Cuyahoga River
The Cuyahoga River is a roughly 100-mile Ohio river flowing into Lake Erie, famous for its June 22, 1969 Cleveland fire that spurred the Clean Water Act, the EPA, and ongoing restoration.
Cuyan - Desaguadero
Cuyan - Desaguadero (FEOW ecoregion 340) is a montane freshwater ecoregion of western Argentina covering the Río Desaguadero drainage, with four endemic Trichomycterid catfishes and the Guanacache Ramsar wetlands.
Cuyuni
Cuyuni (Río Cuyuní), a river rising in Venezuela's Bolívar State and flowing through Guyana into the Essequibo near Bartica; a major Essequibo tributary central to the Venezuela–Guyana Essequibo dispute and to gold-mining mercury contamination.
Dalälven
Dalälven, Swedish river system formed by Västerdalälven and Österdalälven; 520 km, Sweden's second longest, draining 29,030 km² to the Bothnian Sea, with about 8% of national hydropower and a timber-floating past.
Dallol Bosso
Dallol Bosso, a fossil valley of an inactive Niger River tributary in southwestern Niger (Zarma name Boboye), is Ramsar site no. 1382, designated 26 April 2004, 892,122 ha, with a shallow alluvial aquifer and the only viable West African giraffe population.
Damodar River (দামোদর নদ)
Damodar River (দামোদর নদ), the 'River of Sorrows', rises in Jharkhand's Palamu Hills and flows 540 km to the Hugli near Kolkata; recurrent floods led to the Damodar Valley Corporation, India's first multipurpose river valley project (1948).
Dan River coal ash spill
The Dan River coal ash spill occurred on February 2, 2014, when a stormwater pipe failed at Duke Energy's retired Dan River Steam Station in Eden, North Carolina.
Danube
The Danube is Europe's second longest river, 2,857 km from Germany's Black Forest to the Black Sea, draining an 800,000 km² basin shared by 19 countries, with major navigation, Iron Gate hydropower, the Danube Delta, and the Roman limes frontier.
Darling River
Darling, also known as Baaka, most commonly refers to the Darling River, a major river beginning in northern New South Wales and flowing southwest to join the Murray at Wentworth.
Daugava
Daugava (Western Dvina, Западная Двина), largest Latvian river: 1,020 km from Russia's Tver region through Belarus to the Baltic Sea; transboundary basin, three HPPs, Staburags flooding, 1987 protest legacy.
Delaware River
The Delaware River is a 330-mile river rising in New York's Catskills and flowing through Pennsylvania, New Jersey, and Delaware to Delaware Bay; Lenape homeland, Washington's 1776 crossing, DRBC-managed, with a tide-monitored salt front.
Delaware River Basin Commission
The Delaware River Basin Commission (DRBC) is a federal-interstate agency that manages the water resources of the Delaware River Basin, created by compact in 1961.
Desaguadero
Desaguadero (Río Desaguadero): the only outlet of Lake Titicaca, a ~390–398 km Andean river on the Peru–Bolivia border flowing south to Lake Poopó in the TDPS endorheic basin, with Holocene terrace records, salinity of 1–2 g/l, and binational management by the ALT.