Why do some people describe europe as a peninsula?

Europe is often described as a “peninsula of peninsulas.” A peninsula is a piece of land surrounded by water on three sides. Europe is a peninsula of the Eurasian supercontinent and is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean, Black, and Caspian seas to the south

Maybe a horizontal because its a pattern

Answerseafloor spreading;