Simplify the following text for a Grade 8 native English-speaking person.
Original: Scandinavia is a region in northern Europe that includes Denmark and the Scandinavian Peninsula 's two countries , Norway and Sweden .
Simplified: The Scandinavian Peninsula is a large peninsula reaching west from northern Europe over the north side of the Baltic Sea . Norway , Sweden and some of Finland are on the peninsula , also known as Fennoscandia .