This is a list of freshwater ecoregions as compiled by the World Wildlife Fund (WWF). The freshwater ecoregion system is similar to that for terrestrial ecoregions. The Earth's land surface is divided into eight terrestrial biogeographic realms or ecozones, which contain hundreds of smaller ecoregions. Ecoregions are classified into biomes or major habitat types, which have similar climates and vegetation types. The freshwater system is similar, with ecoregions classified into freshwater realms and biomes.
Afrotropical Ecoregions are sorted by biome (major habitat type). The numbers are WWF's ecoregion codes.
Large lakes
559; Lake Malawi; (Malawi, Mozambique, Tanzania) 565; Lake Rukwa; (Tanzania) 542; Lake Tanganyika; (Burundi, Democratic Republic of the Congo, Rwanda, Tanzania, Zambia) 530; Lake Turkana; (Kenya) 521; Lake Victoria Basin; (Burundi, Democratic Republic of the Congo, Kenya, Tanzania, Uganda)
Large river deltas
506; Niger Delta;
Montane freshwaters
541; Albertine Highlands; 577; Amatolo - Winterberg Highlands; 574; Drakensberg - Maluti Highlands; 563; Eastern Zimbabwe Highlands; 525; Ethiopian Highlands; 510; Fouta Djallon; 526; Lake Tana; 581; Madagascar Eastern Highlands; 513; Mount Nimba; 562; Mulanje; 519; Western Equatorial Crater Lakes;
Oceanic Islands
584; Comoros-Mayotte; 586; Mascarenes; 585; Seychelles;
Temperate coastal rivers
578; Cape Fold;
Temperate upland rivers
575; Southern Temperate Highveld;
Tropical and subtropical coastal rivers
515; Ashanti; 517; Bight Drainages; 564; Coastal East Africa; 551; Cuanza; 514; Eburneo; 583; Madagascar Eastern Lowlands; 533; Northern Gulf of Guinea Drainages - Bioko; 511; Northern Upper Guinea; 532; Ogooue - Nyanga - Kouilou - Niari; 568; Pangani; 587; São Tomé, Príncipe, and Annobón; 518; Southern Gulf of Guinea Drainages; 512; Southern Upper Guinea; 567; Tana, Athi and Coastal Drainages; 576; Zambezian Lowveld;
Tropical and subtropical floodplain rivers and wetland complexes
544; Bangweulu Wetlands - Mweru; 537; Cuvette Centrale; 508; Inner Niger Delta; 557; Kafue; 546; Kasai; 550; Lower Congo; 549; Lower Congo Rapids; 505; Lower Niger - Benue; 561; Lower Zambezi; 547; Mai-Ndombe; 543; Malagarasi-Moyowosi; 548; Malebo Pool; 558; Middle Zambezi - Luangwa; 580; Northwestern Madagascar; 569; Okavango; 534; Sangha; 509; Senegal - Gambia; 535; Sudanic Congo - Oubangi; 538; Tumba; 539; Upper Congo Rapids; 545; Upper Lualaba; 522; Upper Nile; 556; Upper Zambezi Floodplains; 516; Volta;
Tropical and subtropical upland rivers
536; Uele; 540; Upper Congo; 507; Upper Niger; 555; Zambezian Headwaters; 560; Zambezian Highveld;
Xeric freshwaters and endorheic (closed) basins
553; Etosha; 529; Horn of Africa; 570; Kalahari; 573; Karoo; 554; Karstveld Sink Holes; 520; Lake Chad; 552; Namib; 528; Northern Eastern Rift; 443; Oman Mountains; 531; Shebelle - Jubba; 566; Southern Eastern Rift; 571; Southern Kalahari; 582; Southern Madagascar; 439; Southwestern Arabian Coast; 579; Western Madagascar; 572; Western Orange;
Australasia
Montane freshwaters
751; Lake Poso; 750; Matano - Southern Malili Lakes; 814; New Guinea Central Mountains; 813; New Guinea North Coast;
Temperate coastal rivers
809; Bass Strait Drainages; 807; Eastern Coastal Australia; 811; New Zealand; 810; Southern Tasmania; 801; Southwestern Australia;
Temperate floodplain rivers and wetlands
808; Murray – Darling;
Tropical and subtropical coastal rivers
805; Arafura - Carpentaria; 817; Bismarck Archipelago; 803; Kimberley; 748; Lesser Sunda Islands; 747; Maluku; (Indonesia) 820; New Caledonia; 816; Papuan Peninsula; 818; Solomon Islands; 815; Southwest New Guinea - Trans-Fly Lowland; 749; Sulawesi; 812; Vogelkop - Bomberai;
Xeric freshwaters and endorheic (closed) basins
806; Great Artesian Basin; 804; Paleo; 802; Pilbara;
Indomalaya
Large river deltas
729; Mekong Delta;
Montane freshwaters
743; Borneo Highlands; 710; Ganges Himalayan Foothills; 723; Inle Lake; 753; Lake Lanao;
Oceanic Islands
768; Andaman Islands; 769; Nicobar Islands;
Tropical and subtropical coastal rivers
736; Aceh; 740; Central & Eastern Java; 767; Coastal Fujian - Zhejiang; 745; Eastern Borneo; 731; Eastern Gulf of Thailand Drainages; 758; Eastern Taiwan; 759; Hainan; 737; Indian Ocean Slope of Sumatra & Java; 741; Kapuas; 719; Lower Brahmaputra - Arakan Coast; 734; Malay Peninsula Eastern Slope; 752; Mindanao; 744; Northeastern Borneo; 760; Northern Annam; 735; Northern Central Sumatra - Western Malaysia; 755; Northern Philippine Islands; 742; Northwestern Borneo; 756; Palawan - Busuanga - Mindoro; 746; Southeastern Borneo; 716; Southeastern Ghats; 730; Southern Annam; 738; Southern Central Sumatra; 739; Southern Sumatra - Western Java; 717; Sri Lanka Dry Zone; 718; Sri Lanka Wet Zone; 715; Western Ghats; 757; Western Taiwan;
Tropical and subtropical floodplain rivers and wetland complexes
732; Chao Phraya; 709; Ganges Delta & Plain; 728; Kretie - Stung Treng (Mekong); 703; Lower & Middle Indus; 722; Lower & Middle Salween; 726; Lower Lan Cang (Mekong); 733; Mae Khlong; 708; Narmada - Tapi; 713; Northern Deccan Plateau; 720; Sitang - Irrawaddy; 761; Song Hong; 714; Southern Deccan Plateau; 763; Xi Yiang;
Tropical and subtropical upland rivers
727; Khorat Plateau (Mekong); 712; Middle Brahmaputra;
Nearctic
Large lakes
109; English - Winnipeg Lakes; 116; Laurentian Great Lakes;
Oceanic Islands
176; Bermuda;
Polar freshwaters
101; Alaskan Coastal; 112; Canadian Arctic Archipelago; 106; Central Arctic Coastal; 105; Lower Mackenzie; 102; Upper Yukon; 111; Western Hudson Bay;
Temperate coastal rivers
103; Alaska & Canada Pacific Coastal; 157; Appalachian Piedmont; 115; Canadian Atlantic Islands; 158; Chesapeake Bay; 140; East Texas Gulf; 113; Eastern Hudson Bay - Ungava; 114; Gulf of St.Lawrence Coastal Drainages; 118; Northeast US & Southeast Canada Atlantic Drainages; 123; Oregon & Northern California Coastal; 141; Sabine - Galveston; 125; Sacramento–San Joaquin; 119; Scotia - Fundy; 110; Southern Hudson Bay; 117; St.Lawrence; 154; West Florida Gulf;
Temperate floodplain rivers and wetlands
155; Apalachicola; 121; Columbia Unglaciated; 149; Lower Mississippi; 135; Lower Rio Grande - Bravo; 143; Middle Missouri; 153; Mobile Bay; 104; Upper Mackenzie; 148; Upper Mississippi;
Temperate upland rivers
146; Central Prairie; 120; Columbia Glaciated; 151; Cumberland; 108; Middle Saskatchewan; 145; Ouachita Highlands; 147; Ozark Highlands; 150; Teays - Old Ohio; 152; Tennessee; 142; Upper Missouri; 132; Upper Rio Grande - Bravo; 107; Upper Saskatchewan; 122; Upper Snake; 144; US Southern Plains;
Tropical and subtropical coastal rivers
156; Florida Peninsula; 162; Sinaloa; 139; West Texas Gulf;
Xeric freshwaters and endorheic (closed) basins
127; Bonneville; 130; Colorado River; 136; Cuatro Ciénegas; 128; Death Valley; 131; Gila; 161; Guzmán–Samalayuca; 126; Lahontan; 165; Lerma - Chapala; 166; Llanos el Salado; 163; Mayran - Viesca; 124; Oregon Lakes; 133; Pecos; 134; Rio Conchos; 137; Salt River (Arizona); 138; Rio San Juan (Mexico); 160; Sonora; 159; Southern California Coastal–Baja California; 129; Vegas - Virgin;
Neotropic
Large lakes
303; Maracaibo;
Large river deltas
323; Amazonas Estuary & Coastal Drainages; 309; Orinoco Delta & Coastal Drainages;
Montane freshwaters
312; Amazonas High Andes; 340; Cuyan - Desaguadero; 305; Orinoco High Andes; 306; Orinoco Piedmont; 317; Ucayali - Urubamba Piedmont; 313; Western Amazon Piedmont;
Oceanic Islands
350; Galápagos Islands; 351; Juan Fernández Islands;
Temperate coastal rivers
347; Bonaerensean Drainages; 334; Laguna dos Patos; 348; Patagonia; 341; South Andean Pacific Slopes; 349; Valdivian Lakes;
Temperate floodplain rivers and wetlands
345; Lower Paraná;
Tropical and subtropical coastal rivers
168; Ameca - Manantlan; 212; Bahama Archipelago; 209; Chagres; 201; Chiapas - Fonseca; 206; Chiriquí River; 172; Coatzacoalcos; 211; Cuba - Cayman Islands; 204; Estero Real - Tempisque; 352; Fluminense; 173; Grijalva - Usumacinta; 214; Hispaniola; 207; Isthmus Caribbean; 213; Jamaica; 203; Mosquitia; 301; North Andean Pacific Slopes - Rio Atrato; 326; Northeastern Caatinga & Coastal Drainages; 328; Northeastern Mata Atlantica; 167; Panuco; 171; Papaloapan; 329; Paraíba do Sul; 215; Puerto Rico - Virgin Islands; 202; Quintana Roo - Motagua; 330; Ribeira de Iguape; 169; Rio Balsas; 164; Rio Santiago; 210; Rio Tuira; 205; San Juan (Nicaragua/Costa Rica); 208; Santa Maria; 170; Sierra Madre del Sur; 304; South America Caribbean Drainages - Trinidad; 331; Southeastern Mata Atlantica; 335; Tramandaí - Mampituba; 216; Windward & Leeward Islands; 175; Yucatán;
Tropical and subtropical floodplain rivers and wetland complexes
316; Amazonas Lowlands; 342; Chaco; 307; Orinoco Llanos; 343; Paraguay; 314; Rio Negro;
Tropical and subtropical upland rivers
315; Amazonas Guiana Shield; 310; Essequibo; 319; Guapore - Iténez; 311; Guianas; 346; Iguassu; 332; Lower Uruguay; 321; Madeira Brazilian Shield; 302; Magdalena - Sinu; 318; Mamoré - Madre de Dios Piedmont; 308; Orinoco Guiana Shield; 325; Parnaíba; 327; S. Francisco; 320; Tapajós - Juruena; 324; Tocantins - Araguaia; 344; Upper Paraná; 333; Upper Uruguay; 174; Upper Usumacinta; 322; Xingu;
Xeric freshwaters and endorheic (closed) basins
338; Atacama; 336; Central Andean Pacific Slopes; 339; Mar Chiquita - Salinas Grandes; 337; Titicaca;
Oceania
Oceanic Islands
217; Cocos Island (Costa Rica); 829; East Caroline Islands; 821; Fiji; 828; Hawaiian Islands; 826; Marquesas Islands; 827; Rapa; 823; Samoas; 824; Society Islands; 825; Tubuai Islands; 819; Vanuatu; 822; Wallis - Futuna; 830; West Caroline Islands;
Palearctic
Large lakes
629; Aral Sea Drainages; 643; Biwa Ko; 452; Caspian Marine; 606; Lake Baikal; 627; Lake Issyk Kul - Upper Chu; 409; Lake Onega - Lake Ladoga; 453; Volga Delta - Northern Caspian Drainages;
Large river deltas
524; Nile Delta;
Montane freshwaters
604; Chuya; 725; Er Hai; 705; Indus Himalayan Foothills; 633; Upper Yellow River; 634; Upper Yellow River Corridor; 706; Upper Indus; 704; Yaghistan; 762; Yunnan Lakes;
Polar freshwater
602; Ob; 610; Anadyr; 407; Barents Sea Drainages; 611; East Chukotka; 401; Iceland - Jan Mayen; 609; Kolyma; 608; Lena; 406; Northern Baltic Drainages; 405; Norwegian Sea Drainages; 607; Taimyr; 605; Yenisei;
Temperate coastal rivers
424; Aegean Drainages; 420; Albania; 501; Atlantic Northwest Africa; 403; Cantabric Coast - Languedoc; 615; Coastal Amur; 426; Crimea Peninsula; 419; Dalmatia; 638; Eastern Yellow Sea Drainages; 415; Gulf of Venice Drainages; 640; Hamgyong - Sanmaek; 642; Honshū - Shikoku - Kyūshū; 421; Ionian Drainages; 416; Italian Peninsula and Islands; 613; Kamchatka and Northern Kurils; 612; Koryakia; 428; Kuban; 502; Mediterranean Northwest Africa; 430; Northern Anatolia; 402; Northern British Isles; 451; Northern Hormuz Drainages; 614; Okhotsk Coast; 437; Orontes River; 641; Sakhalin, Hokkaido, and Sikhote-Alin Coast; 639; Southeastern Korean Peninsula; 432; Southern Anatolia; 408; Southern Baltic Lowlands; 423; Thrace; 422; Vardar; 429; Western Anatolia; 412; Western Iberia; 433; Western Transcaucasia;
Temperate floodplain rivers and wetlands
404; Central & Western Europe; 425; Dnieper - Southern Bug; 418; Dniester - Lower Danube; 427; Don; 414; Eastern Iberia; 635; Yellow River Great Bend; 434; Kura - South Caspian Drainages; 637; Liao He; 616; Lower Amur; 636; Lower Yellow River; 441; Lower Tigris & Euphrates; 766; Lower Yangtze; 620; Songhua Jiang; 413; Southern Iberia; 442; Upper Tigris & Euphrates; 410; Volga - Ural;
Temperate upland rivers
618; Argun; 626; Lower & Middle Syr Darya; 630; Middle Amu Darya; 617; Middle Amur; 765; Middle Yangtze; 628; Northern Central Asian Highlands; 632; Qaidan; 619; Shilka (Amur); 417; Upper Danube; 603; Upper Irtysh; 764; Upper Yangtze;
Tropical and subtropical upland rivers
711; Upper Brahmaputra;