Baltic Sea, a large inland sea of northern Europe. Its area is about 163,000 square miles (422,000 km2); length, slightly more than 1,000 miles (1,600 km); maximum width, about 200 miles (320 km).
OCEANS & SEAS
Most of the planet Earth is covered by water. Did you know that beneath the Atlantic Ocean there are mountain ranges greater than anything on the continents?
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