Rivers and TributariesVersión en línea For Dr. Cooper's Quiz por Maren Graham 1 St. Lawrence 2 Mississippi 3 Ohio 4 Missouri 5 Hudson 6 Rio Grande 7 Amazon 8 Orinoco 9 Thames 10 Seine 11 Arno 12 Tiber 13 Danube 14 Loire 15 Ebro 16 Po 17 Volga 18 Rhine 19 Nile 20 Niger 21 Congo 22 Tigris 23 Euphrates 24 Indus 25 Ganges 26 Mekong 27 Yangtze 28 Yellow Explanation 3 flows into Mississippi - tributary 4 longest Western tributary - flows into Mississippi 5 New York City 6 Separates Mexico from the US 7 second largest river in the world 9 London 10 Paris 11 Florence 12 Rome 13 Circles through Europe - goes through Sophia, Vienna, Budapest 14 longest river in France 15 longest river in Spain 16 longest river in Italy 17 longest river in Europe 18 Mouth is in the Netherlands -- one of the most important rivers in Europe 19 longest river in the world 21 goes through the center of Africa (horizontally) 24 One of the starting places of civilization, goes through Pakistan