Aosta is the principal city of the Aosta Valley, a bilingual region in the Italian Alps, 110 km (68 mi) north-northwest of Turin. It is situated near the Italian entrance of the Mont Blanc Tunnel, at the confluence of the Buthier and the Dora Baltea, and at the junction of the Great and Little St Bernard Pass routes.

Aosta railway station is the main station serving the city and comune of Aosta, in the autonomous region of Aosta Valley, northwestern Italy. Opened in 1886, it forms part of the Chivasso–Ivrea–Aosta railway, and is also a junction station for a branch line to the nearby Pré-Saint-Didier comune, in the Valdigne, on the way towards Courmayeur.