Completar frases riversVersión en línea Rivers por Juanma Arrabe 1 Rhine Danube Volga Rhine Volga Volga Rhine Danube The starts in the Alps and flows into the North Sea . The flows into the Black Sea . The is the longest river in Europe and it is in Russia . In the river , you can see salmon and trouts . The flows into the Caspian Sea . In the , you can see pelicans and seals . Tne flows through six countries in Europe ( Germany , France . . . ) The flows through ten countries in Europe .