With a total area of , Monte Isola ranks as the largest lake island not only in Italy, but also in South and Central Europe.
Monte Isola includes 12 frazioni: Carzano, Cure, Masse, Menzino, Novale, Olzano, Peschiera Maraglio, Porto di Siviano, Sensole, Senzano, Sinchignano and Siviano.