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In page Schleswig-Holstein:

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The term "Schleswig" originally referred to the city of Schleswig. The word Schleswig is a German transliteration of the Danish word Slesvig, which consists of two words: Schlei and vig. The Schlei refers to the river at which the city lies, and vig means "inlet" or bay. Schleswig therefore means (in Danish): "The bay at the river Schlei". The Schlei is known as Slien in Danish and is believed to have been used only for the inner Slien (the Great and Little Bay near the city of Schleswig). The word is thought to be related to Slæ, which means reeds and aquatic plants found in this area.[citation needed]