Answer:

VOLGA

Answer	Crossword Clue
VOLGA	Waterway in Russia
VOLGA	It's about 500 miles longer than the Danube
VOLGA	Europe's longest river

VOLGA	Caspian Sea feeder
VOLGA	Caspian feeder
VOLGA	River to the Caspian Sea
VOLGA	Russian river
VOLGA	Ulyanovsk's river
VOLGA	River that originates in Russia's Valdai Hills
VOLGA	River that starts in the Valdai Hills
VOLGA	River through western Russia

VOLGA	Longest river in Europe
VOLGA	River through Russia
VOLGA	Russia's longest river
VOLGA	Major river of Russia
VOLGA	Longest river of Europe.
VOLGA	River flowing into Caspian Sea at Astrakhan.
VOLGA	2,325-mile river.
VOLGA	Song of the ... Boatmen.

VOLGA	River where Catherine sailed.
VOLGA	Largest river in Europe.
VOLGA	It flows from the Valdai Hills to the Caspian.
VOLGA	River in a song.
VOLGA	The largest river in Europe, 2,325 miles.
VOLGA	Astrakhan's river.
VOLGA	Important waterway of Europe.
VOLGA	Gorki's waterfront.

VOLGA	Long river of Europe.
VOLGA	Kuibishev's river.
VOLGA	Historic river.
VOLGA	Historic waterway.
VOLGA	Largest river of Europe.
VOLGA	Gorki's river.
VOLGA	Kazan's river.
VOLGA	River of song.

VOLGA	River to the Caspian Sea.
VOLGA	Boatmen's river
VOLGA	River for some boatmen
VOLGA	Certain boatman
VOLGA	River of song