Statistics for European Rivers by Tributaries

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Tributaries	River	% Correct
Main, Moselle, Neckar, Erft, Thur, Aar, Moder, Ruhr, Sieg, Lippe	Rhine	97%
Durance, Saône, Arve, Drôme, Ouvèze, Eyrieux, Valserine	Rhône	97%
Sava, Tisza, Prut, Siret, Drava, Olt, Inn	Danube	93%
Oka, Kama, Vetluga, Sura, Uzola, Kazanka, Samara	Volga	90%
Panaro, Secchia, Mincio, Oglio, Enza, Parma, Adda, Taro, Tanaro, Dora Baltea, Ticino, Oglio	Po	86%
Churn, Wey, Mole, Kennet, Cherwell, Lea, Colne	Thames	86%
Allier, Vienne, Cher, Indre, Maine, Erdre, Arroux	Loire	83%
Donets, Khopyor, Krasivaya Mecha, Medveditsa, Voronezh, Bityug, Ilovlya, Manych	Don	76%
Úpa, Metuje, Jizera, Vltava/Moldau, Saale, Schwarze Elster, Havel, Elde	Elbe	69%
Marne, Oise, Aube, Risle, Eure, Loing, Yonne	Seine	69%
Narew, San, Wieprz, Pilica, Dunajec, Brda, Drwęca, Wda	Vistula	69%
Jarama, Algodor, Guadarrama, Alberche, Tiétar, Almonte, Alagón, Zêzere	Tagus	66%
Lybid, Drut, Irpin', Teteriv, Bazavluk, Pripyat, Sozh	Dnieper	62%
Stour, Wye, Teme, Avon, Usk, Vyrnwy, Rad Brook	Severn	62%
Warta, Bóbr, Nysa Łużycka (Lusatian Neisse), Nysa Kłodzka (Eastern Neisse), Opava, Olše	Oder	55%
Boyle, Inny, Suck, Mulkear, Brosna, Owenmore, Maigue	Shannon	52%
Werre, Aller, Diemel, Hunte, Fulda	Weser	41%
Pisuerga, Esla, Águeda, Côa, Corgo, Sousa, Tâmega	Douro	31%
Sambre, Rur, Chiers, Lesse, Ourthe, Geul, Niers	Meuse	31%
Tauber, Fränkische Saale, Kinzig, Nidda	Main	28%
Okhta, Izhora, Tosna, Mga	Neva	24%