What 5 main islands make up Denmark?

The 5 main islands that make up Denmrk are Zealand, Fyn ,Funen , Lolland ,Jutland.

Nb. Fyn is actually another name for the island of Funen. So, there are four main islands and they are (in order of size): Jutland, Zealand, Funen (Fyn) and Lolland.