Sjælland, also Zealand, island of eastern Denmark. The largest and most important island of Denmark, it lies between the Kattegat and the Baltic Sea; it is separated by the strait of Øresund from Sweden and by the Storebælt (Great Belt) from the island of Fyn. The coasts, which are rockbound on the southeast, are indented by bays and fjords. Agriculture and cattle breeding are the leading occupations. The chief city is Copenhagen, the Danish capital. Area, 7,031 sq km (2,715 sq mi); population (1994) 2,159,260.