Blanc, Mont (French: Italian: Monte Bianco), the highest mountain in the Alps. It lies on the French-Italian border with its peak in Haute-Savoie department of southeastern France. Mont Blanc rises 15,771 feet (4,807 m) above sea level, the highest elevation in Europe west of the Caucasus Mountains.

On the northern slopes are huge glaciers, most famous of which is the Mer de Glace (Sea of Ice). Mont Blanc has long attracted climbers and winter sports enthusiasts. Many resorts and spas are found in the area. Mont Blanc was first climbed in 1786, by Jacques Balmat and Michel Paccard of France.

Vehicular travel through the Alps was greatly improved by the opening of the 7.2-mile (11.6-km) Mont Blanc Tunnel, linking Chamonix, France, and Courmayeur, Italy. The tunnel was opened in 1965.