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The paper discusses water renewal of the Baltic Sea, a semi-enclosed basin, the general configuration of the water balance, the size and distribution of its individual elements and the interrelations between them. Connections between long-term variations in the water balance and certain ecological features are stressed. To make possible a deepened understanding of the water renewal, international cooperation has been organized between the seven riparian countries.

THE BALTIC SEA - A SEMI-ENCLOSED SEA, AS SEEN BY THE HYDROLOGIST