It rises from the small lake near Monte Capezzone at an elevation of 2100 meters Omegna - Varallo - Lago d'Orta'', Kompass map 1:50.000 scale nr.97 and runs through the Valle Strona (the communes of Valstrona, Massiola, Quarna Sopra, Loreglia, Germagno, Omegna, Casale Corte Cerro and Gravellona Toce) before entering the Toce.