| Length | Major Cities | Answer | % Correct |
|---|---|---|---|
| 2860km | Budapest, Vienna | Danube | 98%
|
| 1236km | Basel, Cologne | Rhine | 85%
|
| 776km | Paris, Rouen | Seine | 75%
|
| 813km | Geneva, Lyon | Rhône | 70%
|
| 682km | Cremona, Turin | Po | 69%
|
| 1013km | Nantes, Orléans | Loire | 67%
|
| 1051km | Dresden, Hamburg | Elbe | 64%
|
| 1047km | Kraków, Warsaw | Vistula | 57%
|
| 406km | Perugia, Rome | Tiber | 53%
|
| 1362km | Tiraspol, Bender | Dniester | 50%
|
| 845km | Szczecin, Wroclaw | Oder | 49%
|
| 527km | Frankfurt, Würzburg | Main | 48%
|
| 1007km | Lisbon, Toledo | Tagus | 48%
|
| 910km | Logroño, Zaragoza | Ebro | 46%
|
| 602km | Bordeaux, Toulouse | Garonne | 44%
|
| 897km | Porto, Valladolid | Douro | 37%
|
| 517km | Innsbruck, Passau | Inn | 37%
|
| 990km | Belgrade, Zagreb | Sava | 33%
|
| 2145km | Kiev, Mogilev | Dniepr | 31%
|
| 950km | Maastricht, Liège | Meuse | 31%
|
| 545km | Metz, Trier | Moselle | 30%
|
| 400km | Berlin, Fürstenwalde | Spree | 30%
|
| 430km | České Budějovice, Prague | Vltava | 26%
|
| 751km | Bremen, Minden | Weser | 26%
|
| 1020km | Riga, Daugavpils | Daugava | 25%
|
| 710km | Maribor, Villach | Drava | 25%
|
| 657km | Córdoba, Seville | Guadalquivir | 25%
|
| 514km | Paris, Saint-Dizier | Marne | 21%
|
| 965km | Szeged, Szolnok | Tisza | 21%
|
| 772km | Brest (BL), Wyszkow | Bug | 20%
|
| 937km | Kaunas, Grodno | Neman | 20%
|
| 742km | Badajoz, Mérida | Guadiana | 19%
|
| 480km | Graz, Tamsweg | Mur | 19%
|
| 473km | Lyon, Mâcon | Saône | 19%
|
| 413km | Halle, Jena | Saale | 18%
|
| 953km | Chernivtsi, Iaşi | Prut | 17%
|
| 482km | Bergerac, Libourne | Dordogne | 16%
|
| 761km | Chernobyl, Mazyr | Prypiat | 16%
|
| 410km | Trento, Verona | Adige | 15%
|
| 550km | Kemijärvi, Rovaniemi | Kemijoki | 15%
|
| 481km | Cahors, Mende | Lot | 15%
|
| 789km | Arad, Târgu Mureş | Mureș | 15%
|
| 490km | Bijeljina, Loznica | Drina | 14%
|
| 621km | Askim, Fredrikstad | Glomma | 14%
|
| 808km | Częstochowa, Poznań | Warta | 14%
|
| 461km | Boden, Luleå | Lule | 13%
|
| 522km | Haparanda, Pello | Torne | 13%
|
| 467km | Lycksele, Umeå | Ume | 13%
|
| 520km | Börlangen, Mora | Dal | 12%
|
| 480km | Edirne, Plovdiv | Maritsa | 12%
|
| 400km | Älvsbyn, Piteå | Pite | 12%
|
| 720km | Gothenburg, Karlstad | Gotä | 11%
|
| 509km | Alzira, Cuenca | Júcar | 11%
|
| 615km | Râmnicu Vâlcea, Slatina | Olt | 11%
|
| 493km | Kraljevo, Smederevo | Morava | 10%
|
| 453km | Sorsele, Vindeln | Vindel | 10%
|
| 440km | Medle, Skelleftea | Skellefte | 9%
|
| 415km | Amphipolis, Pernik | Struma | 9%
|
| 453km | Besançon, Montbéliard | Doubs | 8%
|
| 417km | Slobozia, Târgoviște | Ialomița | 8%
|
| 460km | Morjärv, Överkalix | Kalix | 8%
|
| 484km | Białystok, Ostroleka | Narew | 8%
|
| 430km | Östersund, Sundsvall | Indal | 7%
|
| 647km | Bacău, Galati | Siret | 7%
|
| 421km | Clermont-Ferrand, Vichy | Allier | 6%
|
| 510km | Kernavė, Vilnius | Neris | 6%
|
| 406km | Trenčín, Žilina | Váh | 6%
|
| 561km | Babruysk, Barysaw | Berezina | 5%
|
| 648km | Gomel,Vietka | Sozh | 5%
|
| 463km | Kramfors, Sollefteå | Ångerman | 4%
|
| 440km | Bollnäs, Ljusdal | Ljusnan | 4%
|
| 415km | Cluj-Napoca, Satu Mare | Someș | 3%
|
| 460km | Sigulda, Valmiera | Gauja | 2%
|