Funen, with an area of 3,099.7 square kilometres (1,196.8 sq mi), is the third-largest island of Denmark, after Zealand and Vendsyssel-Thy. It is the 165th-largest island in the world. It is located in the central part of the country and has a population of 469,947 as of 2020. Fyn's main city is Odense, which is connected to the sea by a seldom-used canal. The city's shipyard, Odense Steel Shipyard, has been relocated outside Odense proper.

The Great Belt is a strait between the major islands of Zealand (Sjælland) and Funen (Fyn) in Denmark. It is one of the three Danish Straits.