710 articles
Nen
Nen (Nenjiang, 嫩江) is the largest tributary of the Songhua River in Northeast China, 1,370 km long, draining about 297,000 km2 across Heilongjiang, Inner Mongolia, and Jilin; noted for wetlands, the Nierji Dam, and Angangxi prehistoric culture.
Neretva
The Neretva is a roughly 225 km transboundary river of Bosnia and Herzegovina and Croatia flowing to the Adriatic, where its delta is a Ramsar wetland since 1992 with high endemism, regulated by hydropower dams.
Neuse River
The Neuse River (Gow-ta-no) is a 250-mile North Carolina river formed by the Eno and Flat Rivers, draining to Pamlico Sound; longest river entirely within the state, home of the CSS Neuse wreck.
Neva (Нева)
Neva (Нева): short (74-78 km) river draining Lake Ladoga into the Gulf of Finland at Saint Petersburg; discharge about 2,500 m3/s, catchment 281,000 km2, delta city, 286 floods, and the 25.4 km flood barrier in operation since 2011.
New Guinea North Coast
New Guinea North Coast (FEOW ecoregion 813) is a freshwater ecoregion spanning northern New Guinea from the Schouten Islands to the Huon Peninsula, with the Mamberamo, Sepik, Ramu, and Markham rivers and 50 endemic fish species including rainbowfish genera Glossolepis and Chilatherina.
Niagara River
The Niagara River connects Lake Erie to Lake Ontario along the New York–Ontario border, drops 160 feet at Niagara Falls, and is governed by the 1909 Boundary Waters Treaty and 1950 Niagara Diversion Treaty, which split power diversions equally while preserving scenic flow.
Niger Delta
The Niger Delta is the large, mangrove-fringed delta where the Niger River meets the Atlantic Ocean in southern Nigeria, home to over 30 million people and the hub of Nigeria's oil industry.
Niger River
The Niger River is a major West African river, about 4,180 km long, rising in Guinea and flowing through Mali, Niger, and Nigeria into the Gulf of Guinea.
Nile Delta
Nile Delta (Lower Egypt, Miṣr Baḥr): triangular Mediterranean lowland of northern Egypt, ~1 m above sea level at the coast, home to half of Egypt's population; sediment trapped behind the Aswan High Dam plus subsidence drive coastal erosion and flooding risk.
Niobrara
The Niobrara is a river in northern Nebraska flowing east to the Missouri River, with 76 miles designated as a national scenic river in 1991.
Noatak
Noatak: a large clearwater river in northwestern Alaska flowing from the Schwatka Mountains to Kotzebue Sound, and the 6.6-million-acre Noatak National Preserve (ANILCA, 1980) protecting its watershed, home to Iñupiat subsistence for over 11,000 years.
North Platte
North Platte River, tributary of the Platte River rising in northern Colorado, looping 350 miles through southeast Wyoming to Nebraska; snowmelt-fed, dammed by seven Bureau of Reclamation reservoirs, irrigating over 440,000 acres.
North Saskatchewan
North Saskatchewan River (Cree: kisiskâciwani-sîpiy, Blackfoot: Omaka-ty), a 1,287 km Canadian river rising in the Saskatchewan Glacier and joining the South Saskatchewan near Prince Albert; dammed by Brazeau and Bighorn dams and a 2024 heritage river.
Northeast US & Southeast Canada Atlantic Drainages
Northeast US & Southeast Canada Atlantic Drainages, FEOW ecoregion 118, temperate coastal rivers from Delaware to the Gaspé Peninsula, draining to the Gulf of St. Lawrence and Bay of Fundy, with diadromous, saltwater-tolerant fish fauna.
Northeastern Caatinga & Coastal Drainages
Northeastern Caatinga & Coastal Drainages is a freshwater ecoregion covering coastal river basins of northeastern Brazil, from Alagoas to Ceará, north of the São Francisco.
Northern Anatolia
Northern Anatolia is a freshwater ecoregion of temperate coastal rivers in Turkey, stretching from the Sakarya basin east to the Kizil and Kelkit basins, draining into the Black Sea.
Northern Annam
Northern Annam (FEOW ecoregion 760) is a freshwater ecoregion of coastal rivers draining the eastern Annamite Range in Vietnam from the Deo Hai Van Pass to the Gianh River, with endemic Schistura loaches.
Northern Baltic Drainages
Northern Baltic Drainages, FEOW ecoregion 406, a Palearctic polar-freshwaters unit covering Fennoscandian rivers and lakes draining to the Baltic Sea and eastern North Sea, with Vänern, Saimaa, and the endemic storsik whitefish.
Northern Dvina
Northern Dvina (Северная Двина), large northwestern Russian river formed by the Sukhona and Yug confluence, flowing 744 km to the White Sea; fifth-largest European basin, major timber route.
Northern Gulf of Guinea Drainages - Bioko
A freshwater ecoregion, FEOW ID 518, covering rivers from Nigeria's Cross River to Cameroon's Wouri estuary plus Bioko Island, with endemic killifishes and endangered status.
Northern Hormuz Drainages
Northern Hormuz Drainages (FEOW ecoregion 451), Iranian coastal rivers draining the southern Zagros to the Strait of Hormuz; main rivers Rasul, Mehran, Kul, Minab; home to endemic Iranocichla cichlids and hot-spring Aphanius ginaonis.
Northern Upper Guinea
Northern Upper Guinea (FEOW ecoregion 511) is a West African freshwater ecoregion of short Atlantic coastal rivers in Guinea, Guinea-Bissau, Sierra Leone, and Liberia, rated Continentally Outstanding for its highly endemic fish, crab, and mollusk fauna.
Northwestern Borneo
Northwestern Borneo (FEOW ecoregion 742) is a freshwater ecoregion covering Sarawak and Brunei's coastal rivers draining to the South China Sea, with 26 endemic fish species and two endemic genera, Paedocypris and Parawaous.
Nueces River
The Nueces River is a 315-mile South Texas river rising on the Edwards Plateau and draining about 16,800 square miles to Nueces Bay; named Río de las Nueces in 1689, it supplies Corpus Christi via Choke Canyon and Lake Corpus Christi.
Ob
Ob (Обь): west Siberian river and FEOW freshwater ecoregion 602 (Polar freshwaters) in Kazakhstan and Russia; Ob-Irtysh basin 2,975,000 km2, 417 km3/year discharge, ~15% of Arctic Ocean river input.
Ob (鄂畢河, rivers_lake_centerlines:24)
The Ob (Обь; 鄂畢河) is a major west Siberian river formed by the Biya and Katun near Biysk, flowing north to the Gulf of Ob; third largest Arctic river by discharge, chief tributary the Irtysh.
Ocmulgee River
The Ocmulgee River, whose name comes from a Hitchiti word meaning "where water boils up," is a 241-mile river in central Georgia and the westernmost major tributary of the Altamaha system.
Oder
Oder (Odra, Latin Viadus/Viadua): Central European river, 840-854 km, rising in the Czech Republic, flowing through Poland, forming the German-Polish border since 1945, and reaching the Baltic via the Szczecin Lagoon; site of the 1997 flood and the 2022 Prymnesium parvum fish-kill disaster.
Ogooué
The Ogooué (Ogowe) is Gabon's principal river, rising in the Republic of the Congo and flowing about 920–1,200 km to the Atlantic. Second-largest Central African river by discharge (~4,750 m³/s), bimodal floods, largely undammed, 308 fish species.
Ogooue - Nyanga - Kouilou - Niari
Ogooue-Nyanga-Kouilou-Niari, FEOW freshwater ecoregion 532, covers the Ogooué, Kouilou-Niari, and Nyanga river basins in Gabon, Congo, DRC, and Cabinda; about a quarter of its fishes are endemic.