The France–Italy border is mainly mountainous. It is 515 kilometres (320 mi) long,[1] in southeast France and northwest Italy. It begins at the west tripoint of France–Italy–Switzerland (45°55′23″N 07°02′40″E﻿ / ﻿45.92306°N 7.04444°E﻿ / 45.92306; 7.04444) near the top of Mont Dolent (3,820 m), in the French commune of Chamonix (department of Haute-Savoie), the Italian city of Courmayeur (Aosta Valley) and the Swiss commune of Orsières (canton of Valais).