Sweden and Norway make up the majority of the Scandinavian Peninsula. However, there is a small part of Finland that extends up to the peninsula, as well as a part of one of the Russian districts. This peninsula is larger than many of the other peninsulas in Europe. The ones it outsizes are the Italian, the Iberian, and the Baltic peninsulas. The peninsula was once part of Denmark, but has since been split up into these four countries.
There are several bodies of water surrounding this peninsula, instead of just one or two. There’s the North Sea and the Baltic Sea to the south. The Barents Sea is north of the peninsula. The Norwegian Sea is to the west, while the Baltic Sea extends to the east.