The three lands of Denmark historically formed the Danish kingdom from its unification and consolidation in the 9th century:
Zealand (Sjælland) and the islands south of it, with Roskilde as a centre
Jutland (Jylland), the western peninsula, and the island of Fyn, with Viborg as a centre.
Scania (Skåneland) on the Scandinavian peninsula, with Lund as a centre