As it crosses the Aosta Valley , the Dora Baltea flows through the city of Aosta ( where the Buthier runs into it ) and near all the main cities of the lower Aosta Valley : Châtillon , Saint-Vincent , Verrès and Pont-Saint-Martin .
As it crosses the Aosta Valley , the Dora Baltea flows through the city of Aosta ( where the Buthier , a small river , runs into it ) and near all the main cities of the lower Aosta Valley : Châtillon , Saint-Vincent , Verrès and Pont-Saint-Martin .