The Czech Republic is called the roof of Europe since its only source of water is atmospheric rain and snowfall. All the rivers which have their source in the area drain into neighboring countries.
The Czech Republic has three river basins:
The Labe (Elbe) River Basin (drains into the North Sea) - 51,399 sq.km. Main rivers: Labe, Vltava
The Odra (Oder) River Basin (drains into the Baltic) - 4,721 sq.km. Main rivers: Odra, Opava, Ostravice and Olše
The Dunaj (Danube) River Basin (drains into the Black Sea) - 22,744 sq. km. Main rivers: Morava, Dyje
The river basins intersect at Kralický Sni3ník on the Polish border.

Lakes and ponds
There are 455 natural lakes in the Czech Republic, 350 of which are river lakes that have formed in the grasslands of larger rivers. A characteristic feature of the Czech landscape is the large number of artificial lakes created for fish-farming. They number 21,800 in total and cover about 41,000 hectares. The largest of them are Lake Rozmberk and Lake Bezdrev in southern Bohemia.