The
Toce is a river in
Piedmont,
Italy, which stretches the length of the
Val d'Ossola from the
Swiss border to
Lake Maggiore into which it debouches near Fondotoce in the
commune of
Verbania. The river is long and is formed in the upper Val Formazza by the confluence of a number of torrents in the plain of Riale. The source of one of these, the Gries, is situated on the Italian southern side of the
Gries Pass; another forms beneath the
Passo di San Giacomo, others flow from little
Alpine lakes such as Lago Castel and Lago di Sabbione.