C Congo Zaire,Congo,Angola 4377 Atlantic Ocean aka Zaire A Amazon Brasil,Peru,Ecuador,Bolivia,Venezuela 6275 Atlantic Ocean largest river in the world, measured watershed area D Danube Germany, Austria,Slovak Rep,Hungary,Croatia,Yugoslavia 2850 Black Sea A Amur Russia,China,Siberia 2824 Tatar Strait confluence of Shilka and Argun A Aisne France 280 Oise A Allegheny USA 523 Monongahela joins at Pittsburgh to form Ohio B Brahmaputra Tibet,China,India,Bangladesh 2900 Bay of Bengal D Dee North East Scotland 140 North Sea E Ems Germany 320 North Sea R Rhine Switzerland,France,Germany,Netherlands 1320 North Sea A Arno Italy 241 Ligurian Sea A Avon,Lower United Kingdom 120 Severn Estuary A Avon,Upper United Kingdom 155 left arm of the Severn C Cauto Cuba 240 Gulf of Guacanayabo longest river in Cuba C Clyde United Kingdom 157 North Sea C Colorado USA,Mexico 2333 Gulf of California E Elbe Czech Republic,Germany 1165 North Sea aka Labe G Guadalquivir Spain 579 Atlantic Ocean deepest river in Spain L Labe Czech Republic,Germany 1165 North Sea aka Elbe L Lena Siberia 4400 Laptev Sea M Maas France,Belgium,Netherlands 926 North Sea aka Meuse L Loire France 1020 Bay of Biscay,Atlantic Ocean longest river in France Y Yukon Canada,USA 2900 Bering Sea Z Zaire Zaire,Congo,Angola 4377 Atlantic Ocean aka Congo Z Zambezi Zambia,Mozambique 2660 Indian Ocean P Po Italy 676 Adriatic Sea longest river in Italy R Rhone Switzerland,France 812 Gulf of Lyon - Mediterranean Sea deepest river in France R Rio Grande de Santiago Mexico 935 Pacific Ocean longest river in Mexico R Ruhr Germany 235 Rhine at Duisburg S Seine France 776 English Channel S Selenga Mongolia 1568 Lake of Baikal C Colorado USA 1438 Gulf of Mexico C Colorado Andes,Argentina 860 Atlantic Ocean B Blackwater Ireland 161 Atlantic Ocean second largest river in Ireland D Daugava Russia,Belarus,Latvia 1022 Baltic Sea aka Western Dvina D Dnieper Belarus,Ukraine 2285 Black Sea D Dniester Ukraine,Moldova,Ukraine 1370 Black Sea D Don England 112 Ouse D Don Russia 1967 Asowsian Sea D Don Scotland 132 North Sea D Douro Spain,Portugal Atlantic Ocean E Earn United Kingdom 73 North Sea E Elbro Spain 930 Mediterranean Sea F Forth United Kingdom 106 North Sea G Ganges India,Bangladesh 2700 Bay of Bengal G Garonne Spain,France 650 Bay of Biscay - Atlantic Ocean G Glatzer Neisse Poland 244 Oder aka Nysa or Neisse G Green River USA 730 Colorado G Guadiana Spain,Portugal Atlantic Ocean H Hudson USA 492 Atlantic Ocean H Humber United Kingdom 40 North Sea I Ill France 205 Rhine I Illinois USA 439 Mississippi I Irrawaddy India,Burma 2012 Bay of Bengal longest river in Burma J Jordan Palestine 260 Dead Sea K Kama Russia 1805 Volga K Kankakee USA 676 together with Illinois L Liffey Ireland 80 Dublin Bay M MacKenzie Canada 4210 Arctic Ocean longest river in Canada M Main Germany 500 Rhine M Marne France 525 Seine M Mekong Laos,Thailand 4350 Gulf of Thailand M Meuse France,Belgium,Netherlands 926 North Sea aka Maas N Neisse Czech Republic,Poland,Germany 225 aka Lusatian Neisse O Ob Mongolia,Russia 3680 Arctic Ocean &Katun O Ohio USA 1577 Mississippi T Tagus Spain,Portugal 1007 Atlantic Ocean aka Tejo T Tejo Spain,Portugal 1007 Atlantic Ocean aka Tagus U Ubangi DRC, Central African Republic 1060 Congo V Volga Russia 3688 Caspian Sea longest river in Europe Y Yalu China 800 Gulf of Korea W Weser Germany 733 North Sea W Warburton South Australia 1632 Southern Ocean aka Murray River Y Yangtze Tibet,China 5632 China Sea Y Yaqui Mexico 620 Gulf of California Y Yellow River China 4150 Yellow Sea aka Hwang-Ho H Hwang-Ho China 4150 Yellow Sea aka Yellow River Y Yenisey Siberia 4184 Kara Sea B Bug Ukraine,Poland 770 Vistula N Neckar Germany 367 Rhine N Niger Guinea,Mali,Niger,Benin,Nigeria 4160 Gulf of Guinea O Orinoco Venezuela,Brazil 2736 Atlantic Ocean P Pechora USSR 1789 Barents Sea P Piave Italy 220 Adriatic Sea U Ural Russia 2534 Caspian Sea V Vistula Poland 1069 Baltic Sea W Wabash USA 960 right arm of Ohio J Jhelum Pakistan M Mississippi USA 3780 M Missouri USA 4040 M Monongahela USA 206 joins Allegheny to form Ohio M Murray Australia 1632 Southern Ocean M Murray-Darling Australia 3490 Southern Ocean longest river in Australia N Neisse Poland 244 Oder aka Nysa or Glatzer Neisse Nile Sudan,Egypt 6671 Mediterranean Sea longest river in the world,two headwaters:white,blue) N Nysa Poland 244 Oder aka Neisse or Glatzer Neisse O Oder Czech Republic,Poland,Germany 907 Baltic Sea joins river Neisse O Ouse United Kingdom 269 Trent P Paraguay Brazil,Paraguay,Argentina Atlantic Ocean P Pineos Greece 200 Aegean Sea R Rio Grande 2800 aka Rio Bravo del Norte,border between Mexico and USA R Rio Bravo del Norte 2800 aka Rio Grande,border between Mexico and USA R Rio Negro 1500 Rio Negro left arm of Amazon R Rio Negro Argentina 650 Atlantic Ocean R Rio Negro 800 left arm of Uruguay R Rio Sao Francisco Brazil 2897 Atlantic Ocean R Rio Tinto Spain Gulf of Cadiz S Sado Portugal Atlantic Ocean S Severn United Kingdom 354 Bristol Channel longest river in United Kingdom S Severn USA 680 Hudson Bay S Shannon Ireland 386 Atlantic Ocean longest river in Ireland S Shenandoah USA 240 Potomac S Somme France 245 English Channel S Spey United Kingdom 171 North Sea S St. Lawrence Canada,USA 3768 Gulf of St. Lawrence S Sutlej Tibet,India,Pakistan 1450 Chenab T Tay United Kingdom 190 North Sea longest river in Scotland T Tees United Kingdom 128 North Sea T Thames United Kingdom 346 North Sea T Tiber Italy 405 Tyrrhenian Sea T Trent United Kingdom 274 Ouse joins Ouse to make Humber T Tweed United Kingdom 156 North Sea T Tyne United Kingdom 130 North Sea Y Yonne France 293 left arm of Seine Y Yser France,Belgium 86 North Sea F Fulda Germany 218 Weser F Flinders Australia 840 Gulf of Carpentaria F Fish River Namibia 650 Oranje longest river in Namibia A Aare Switzerlad 291 Rhine at Koblenz U Ume Sweden 460 Gulf of Bothnia E Enns Austria 254 Danube K Klarälven Sweden,Norway 460 Vänern longest river in Sweden,aka Trysilelva T Trysilelva Sweden,Norway 460 Vänern longest river in Sweden,aka Klarälven O Olt Romania Danube K Kemijoki Finland 345 Gulf of Bothnia K Krishna India about 1300 Bay of Bengal W Warta Poland 760 Oder W Waal Netherlands 84 Maas main arm off Rhine, together with Maas forms Upper Merwede B Berezina Belarus 585 aka Beresina,tributary of Dnieper B Boyne Ireland 112 Irish Sea C Calabar Nigeria E Exe England 97 F Findhorn Scotland 105 Findhorn Bay,Moray Firth H Havel Germany 346 Elbe H Harirud Afghanistan,Turkmenistan 1100 aka Tejen or Tedzhen T Tedzhen Afghanistan,Turkmenistan 1100 aka Harirud or Tejen T Tejen Afghanistan,Turkmenistan 1100 aka Harirud or Tedzhen I Isar Austria,Germany 286 Danube I Isère France T Tana NorwayFinland 330 Tana Fjord,Atlantic Ocean aka Teno T Teno NorwayFinland 330 Tana Fjord,Atlantic Ocean aka Tana K Kura Turkey,Georgia,Azerbaijan 1364 K Körös Hungary 560 Tisza F Fehér-Körös Romania,Hungary joins Fekete-Körös to form Körös F Fekete-Körös Romania,Hungary S Sebes-Körös Romania,Hungary P Pilica Poland 319 V Vilaine France 225 Atlantic Ocean V Vienne France 372 Loire B Balsas Mexico 771 Pacific Ocean O Olenyok Siberia 2292 Laptev Sea aka Olenek O Olenek Siberia 2292 Laptev Sea aka Olenyok L Loir France 312 Sarthe L Lippe Germany 255 Rhine L Lahn Germany 242 Rhine W Werra Germany M Moselle France,Luxembourg,Germany 544 Rhine aka Mosel N Naab Germany 165 Danube T Torne Sweden,Finland 522 Gulf of Bothnia aka Tornionjoki,border between Sweden and Finland T Tornionjoki, Sweden,Finland 522 Gulf of Bothnia aka Torne,border between Sweden and Finland A Aller Germany 263 Weser . .