The Eastern Front stretched from the Baltic sea to the Black sea in WWI.
You may be thinking of the 630 km Siegfried Line
The Russian trade route ran from the Baltic Sea to the Black Sea.
Baltic Sea
Europe is bounded by the North Sea, the Atlantic Ocean and the Mediterranean.It contains the Baltic Sea, The Adriatic Sea and the Aegean Sea.
baltic area
Black sea Baltic sea Mediterranean sea North sea
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The Baltic Sea
Oresund. The Baltic is between Finland and Estonia, Latvia, and Lithuania
Stockholm is on the coast of the Baltic sea.
Russia
The Baltic Sea.