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How large is the Baltic Sea?

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Map showing the physical features, major cities, and national boundaries around the Baltic Sea, North Sea, and English Channel regions of northern and western Europe. The map highlights coastal countries including the United Kingdom, Norway, Denmark, Germany, the Netherlands, Belgium, France, Sweden, Finland, Estonia, Latvia, Lithuania, Poland, and Russia, with sea depths indicated and key islands, peninsulas, and underwater trenches labeled. — Baltic Sea The Baltic Sea, the North Sea, and the English Channel.

The Baltic Sea covers an area of approximately 149,000 square miles (386,000 square km).1

In terms of its dimensions, the sea's major axis—stretching from eastern Denmark to southern Finland—is slightly more than 1,000 miles (1,600 km) long, with an average width of about 120 miles (190 km).1