Beltsee

peninsula is bounded by is referred to as da:Bælthavet in Danish and de:Beltsee in German, a designation deriving from the Great, Little, and Fehmarn belts

Günter Dietrich: Oberflächenströmungen im Kattegat, im Sund und in der Beltsee. In: Deutsche Hydrographische Zeitschrift. 4, 1951, S. 129-150 (Surface