The Schlei (Danish: Slien) is a narrow inlet of the Baltic Sea in Schleswig-Holstein in northern Germany. It stretches for approximately 20 miles from the Baltic near Kappeln and Arnis to the city of Schleswig. Along the Schlei are many small bays and swamps. The important Viking settlement of Hedeby was located at the head of the firth (fjord), but was later abandoned in favor of the city of Schleswig. A museum has been built on the site, telling the story of the abandoned town.

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Coordinates: 54°35′N 9°50′E / 54.59°N 9.83°E / 54.59; 9.83