 Borgo is in one of the tightest parts of Valsugana, mount Ciolino and mount Rocchetta, neither very high.It grew on the two sides of river Brenta and its ancient part is the only one in Trentino to occupy both sides of a river (Trento, for instance, is located on only one side of river Adige).Borgo Valsugana, whose ancient name was Ausugum (the main street of the town, indeed, is named "Corso Ausugum"), used to be a Roman settlement along the Claudia Augusta Altinate road which connected Altino to Tridentum (ancient name for Trento) and then to Augsburg, nowadays in Germany.