710 articles
Caspian Highlands
The Caspian Highlands, ecoregion 446 in the Freshwater Ecoregions of the World system, is a freshwater region in Iran draining to the Caspian Sea, chiefly the upper Safid River watershed.
Cataracts of the Nile
Cataracts of the Nile: six rocky rapids stretches between Aswan, Egypt and Khartoum, Sudan, formed by granite outcrops, obstructing navigation and marking ancient Egypt's southern border with Nubia.
Catawba River
The Catawba River rises in western North Carolina, flows about 220 miles into South Carolina, and becomes the Wateree below Lake Wateree Dam. Also called yeh is-WAH h'reh country of the Catawba Nation, it is a chain of 11 Duke Energy reservoirs and 13 hydropower stations supplying about 2 million people.
Catchment area
A catchment area is the land where rain and snowmelt drain downhill into a common river, lake, or sea, known in some regions as a drainage basin or watershed.
Central & Western Europe
Central & Western Europe (FEOW ecoregion 404) is a temperate floodplain-rivers freshwater ecoregion spanning 19 countries from England to Belarus, with Coregonus-dominated endemism in alpine lakes and 70-90% floodplain loss in its large rivers.
Central Andean Pacific Slopes
The Central Andean Pacific Slopes is a freshwater ecoregion covering all Peruvian Pacific coastal river basins, home to 17 endemic fish species and canyons deeper than the Grand Canyon.
Central Prairie
Central Prairie is a temperate upland rivers freshwater ecoregion, FEOW ID 146, covering the lower Missouri and upper Arkansas river watersheds across Missouri, Kansas, Oklahoma, and Arkansas, with endemic darters.
Central Water Commission
The Central Water Commission (CWC) is the main technical arm of India's Ministry of Jal Shakti, established in 1945 to coordinate flood management, irrigation, and water development.
Chagres
Chagres (Río Chagres), Panamanian river flowing to the Caribbean; dammed 1910 to form Lake Gatún, sole water source of the Panama Canal, and protected by Chagres National Park.
Chambal River
The Chambal River is a major tributary of the Yamuna in India, rising in the Vindhya range and flowing through Madhya Pradesh, Rajasthan, and Uttar Pradesh.
Chao Phraya River
Chao Phraya River (แม่น้ำเจ้าพระยา), Thailand's principal river, drains a 158,587 km² basin formed by the Ping and Nan rivers, flows through Bangkok's delta to the Gulf of Thailand, and faces heavy metal, BPA, and flood pressures.
Chara
Chara (Чара) is an 851 km left tributary of the Olekma in Eastern Siberia, and the name of the village Chara, the BAM town Novaya Chara, the Chara Sands dunes, and the gemstone charoite.
Charles River
The Charles River is an 80-mile Massachusetts river flowing from Hopkinton to Boston Harbor through a 310-square-mile watershed. Known for its 1910 dam, the Clean Charles River cleanup, and the Head of the Charles Regatta.
Chattahoochee River
Chattahoochee River: Georgia river rising in the Blue Ridge Mountains, joining the Flint to form the Apalachicola; supplies 70% of metro Atlanta's drinking water and is the focus of the Georgia-Alabama-Florida water dispute.
Chenab River (چناب)
Chenab River (چناب), Greek Acesines, a major Punjab river of the Indus system formed by the Chandra and Bhaga confluence; a Western River allocated to Pakistan under the 1960 Indus Waters Treaty, now affected by India's 2025 abeyance and Hague arbitration.
Chi
Chi (แม่น้ำชี), river in northeast Thailand, largest tributary of the Mun River, which it joins in Si Sa Ket; 49,476 km² basin, rice-farming floodplain, right-bank Mekong tributary system.
Chiapas - Fonseca
Chiapas - Fonseca, ecoregion 201 in the Freshwater Ecoregions of the World scheme, covers Pacific coastal rivers and lakes from Oaxaca, Mexico, to southern Honduras.
Chicago River
The Chicago River is an Illinois river reversed in 1900 via the 28-mile Sanitary and Ship Canal so it flows away from Lake Michigan toward the Mississippi system, with branches, TARP reservoirs, and recovering water quality.
Chin Hills - Arakan Coast
Chin Hills - Arakan Coast is a freshwater ecoregion (FEOW 719) covering lower Brahmaputra headwaters and coastal basins draining to the Bay of Bengal in India, Bangladesh, and Myanmar.
Chindwin
Chindwin River, largest tributary of Myanmar's Ayeyarwady (Irrawaddy), about 900 km long, rising in the Hukawng Valley and joining the Ayeyarwady near Pakokku; basin about 114,000 km2, 15% in India.
Chiriqui
Chiriqui (Chiriquí) names a western Panama province, the Chiriquí and Chiriquí Viejo rivers, the Gulf of Chiriqui, and FEOW freshwater ecoregion 206 on the Pacific slope of southern Costa Rica and western Panama.
Chubut
Chubut River (Río Chubut, Afon Camwy), 1,080 km Andes-to-Atlantic Patagonian river; basin covers over 60% of Chubut Province, mean discharge 1.1 km³/year, regulated by the 1963 Florentino Ameghino dam, supplies over half the province and the Welsh-settled lower valley.
Chulym
Chulym (Чулым), Siberian river and largest right tributary of the Ob, 1,799 km long with a 134,000 km² basin, formed by the Bely and Chorny Iyus, snow-fed, navigable 1,173 km, distinct from the smaller Novosibirsk Chulym.
Chuna
The Chuna (Чуна), known as the Uda (Уда) upstream, is a 1,203 km river in southeastern Siberia, Russia, that joins the Biryusa to form the Taseeva.
Clark Fork River
The Clark Fork River, or Clark Fork of the Columbia, is Montana's largest river by volume, flowing more than 280 miles to Lake Pend Oreille in Idaho.
Coastal Amur
Coastal Amur (FEOW ecoregion 615) is a Russian Far East freshwater ecoregion of temperate coastal rivers around the Amur River estuary, Amurskiy Liman, northwest Sakhalin, and the Shantary Islands, draining to the Sea of Okhotsk, with no endemic fish species.
Coastal Fujian - Zeijang
Coastal Fujian - Zeijang, FEOW freshwater ecoregion 767, Indo-Malay tropical and subtropical coastal rivers; coastal drainages of Fujian and Zhejiang provinces between the Pearl River and Qiantang River, including the Han, Jiulong, Min, and Ou rivers.
Coco
Coco (Río Coco, Wangki/Wangli, Segovia): longest river of the Central American isthmus, 685 km, forming the Nicaragua–Honduras border, draining 28,280 km² into the Caribbean at Cape Gracias a Dios; home to Miskito communities.
Cocytus (Κωκυτός)
Cocytus (Κωκυτός, Kokytos), the river of wailing of the Greek underworld, a branch of the Styx flowing into the Acheron in Homer; also a real Thesprotian tributary of the Acheron and Dante's frozen lake of Hell.
Colorado (river, United States)
The Colorado River is a major river of the western United States and northwestern Mexico whose basin supplies water to about 40 million people and irrigates 5.5 million acres of farmland.