What is the second longest river in Europe?
Danube River
Danube
Danube
Danube
Danube
Danube
Danube
Danube
The Danube
Danube
Danube
The Danube
Danube
Danube
The Danube
Vistula
Danube
River Danube
Vistula
The Danube
Danube
River Danube
Danube
Vistula
The Danube
Danube
Irtysh
Danube River
Vistula
River Danube
Volga
Danube
Vistula River
Irtysh
The Danube
The Vistula
Danube River
Danube
Ro Negro
The Danube River
Vistula
Volga
Tisza
River Danube
Danube
The Vistula
Irtysh
Ro Negro
Vistula River
Danube River
The Danube
Tisza
Vistula
Neretva
The Vistula River
The Danube River
Volga
Danube
Seversky Donets
Ro Negro
Irrawaddy
Via Pontica
River Danube
Tisza
Neretva
Danube River
Danube
Vistula
Volga
The Danube
Vistula River
Rhine
Ro Negro
Seversky Donets
The Vistula River
Irrawaddy
Ro Paraná
Tisza
Volga River
The Danube River
Neretva
Ro Grande de Santiago
Irrawaddy River
Danube River
Elbe
River Danube
Tisza
Ro Negro
Vistula
IJsselmeer
Ro Paraná
Rhine
Ro Guaporé
Volga
Vistula River
Elbe
IJssel
The Danube
Ro Grande de Santiago
Irrawaddy
Irrawaddy River
Rhône
Danube River
Tisza
Rhine
Neretva
Volga River
Ro Negro
The Danube River
IJsselmeer
Ro Paraná
Elbe
IJssel
River Danube
Vistula
Volga
Rhône
The Danube
Via Emilia
The Vistula
Ro Grande de Santiago
Tisza
Seine
Ro Negro
Danube River
Vistula River
Elbe
IJsselmeer
Evros
Rhine
Neretva
Ro Paraná
Irrawaddy River
Danube.
Ro Guaporé
IJssel
Rhône
Danube -
Irrawaddy
The Volga
The Danube
Ro Grande de Santiago
Tisza
Vistula
The Danube River
Elbe
Rhine
Severnaya
Danube River
Ro Negro
The Vistula
Volga
IJsselmeer
Rhône
Danube:
IJssel
Danube.
Ro Paraná
River Danube
Ro Guaporé
Danube -
Seine
Danube, Rhine
The Danube
Vistula River
Tisza
Elbe
Ro Grande de Santiago
Ruhr
Vistula
Danube River
Rhône
IJsselmeer
IJssel
Rhine
Severn
Ro Paraná
Volga
Viadana
Neretva River
Ro Guaporé
Severnaya
Ro Uruguay
Danube -
The Danube River
The Danube
Elbe
Tisza
Ruhr
Ro Grande de Santiago
Rhône
The Vistula River
Ro de Oro
Danube.
Danube River
Rhine
IJssel
Sava
Seine
Severn
IJsselmeer