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The Sea of Åland (Finnish: Ahvenanmeri; Swedish: Ålands hav) is a waterway in the southern Gulf of Bothnia, between the Åland islands and Sweden. It connects the Bothnian Sea with the Baltic Sea proper. The seas are often choppy here. The narrowest part is named South Kvarken. The trench running on the bottom of the Sea of Åland contains the second deepest spot of the Baltic Sea, at a depth of 301 meters, which is second only to Landsort Deep.
Map of %C3%85lands hav
Many ferries moving between Finland and Sweden cross the Sea of Åland.
References
Sea of Åland Wikipedia(Text) CC BY-SA