Garbagna borders the following municipalities: Avolasca, Borghetto di Borbera, Brignano-Frascata, Casasco, Castellania Coppi, Dernice, and Sardigliano.
Garbagna is situated adjacent to: Avolasca, Borghetto di Borbera, Brignano-Frascata, Casasco, Castellania Coppi, Dernice, and Sardigliano.