Totalling 18.91 km2 (7.30 square miles), the area extends on the orographically left, i.e. eastern flank of the South Tyrolean Lowlands (Unterland), as the section of the Adige valley between Bolzano and the Salorno chasm is called.

The Castelfeder hill (405 m or 1,329 feet) between Neumarkt and Auer protrudes west of the main town into the Adige valley.

This vast majority of this ridge is part of the protected Trudner Horn Nature Park and borders on the municipality of Truden.

To the North, the Schwarzenbach valley forms the border to Aldein; here, a narrow strip of the municipality encloses parts of Kaltenbrunn (970–1,000 m or 3,180–3,280 feet).

The municipality of Montan contains the frazioni (subdivisions, mainly villages and hamlets) Glen (Gleno), Gschnon (Casignano), Kaltenbrunn (Fontanefredde), Kalditsch (Doladizza), and Pinzon (Pinzano).

Local names of pre-Roman (Gomaroa, Tschalfai) and Romanesque (Kalditsch, Montan, Glen, Pinzon) origin suggest a lively settlement activity in the centuries BC and AD.