The Italian peninsula, also known as the Italic peninsula, Apennine peninsula, Italian boot, or mainland Italy, is a peninsula, within the Italian geographical region, extending from the southern Alps in the north to the central Mediterranean Sea in the south which comprises much of the country of Italy and the enclaved microstates of San Marino and Vati…The Italian peninsula, also known as the Italic peninsula, Apennine peninsula, Italian boot, or mainland Italy, is a peninsula, within the Italian geographical region, extending from the southern Alps in the north to the central Mediterranean Sea in the south which comprises much of the country of Italy and the enclaved microstates of San Marino and Vatican City.