The Breithorn is a mountain range of the Pennine Alps with its highest peak of the same name (but also called "Breithorn (Western Summit)"). It is on the border between Switzerland and Italy. It lies on the main chain of the Alps. It is a halfway between the Matterhorn and Monte Rosa and east of the Theodul Pass. The nearest settlements are Zermatt (Valais) and St-Jacques (Aosta Valley).