 The Apennine Mountains form the peninsula's backbone, and the Alps form most of its northern boundary, where Italy's highest point is located on Mont Blanc (Monte Bianco) ().Other worldwide-known mountains in Italy include the Matterhorn (Monte Cervino), Monte Rosa, Gran Paradiso in the West Alps, and Bernina, Stelvio and Dolomites along the eastern side.The Po, Italy's longest river (), flows from the Alps on the western border with France and crosses the Padan plain on its way to the Adriatic Sea.