Voronež, Oblast' di Voronež, Russia
Inside the city, the Voronezh river turns into a reservoir known as the “Voronezh sea” — in 1972 the river was dammed up, flooding forests and meadows for irrigation and providing water for industry. The sight is impressive: the reservoir is 50 km long and covers an area of 70 sq. km. No other city in Europe has such a large artificial reservoir within its confines.