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The belt is about 50 km long and 800m to 28 km wide, the maximum depth is approximately 75 m, and contains numerous small Danish islands.
The Belt is mentioned in the German national anthem (written 1841), the Deutschlandlied, to define the northern limit of territories advocated in the song as a unified Germany. Its inclusion reflects the bilingual nature of the former Duchy of Schleswig, which as populated by both Danes, Germans and bilinguals. It was also mentioned for the same reason in the 1813 song, Was ist des Deutschen Vaterland?, written by Ernst Moritz Arndt.
See also 
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