anti-clockwise: Val d'Ossola Valle Anzasca Valle Antrona Val Bognanco Val Divedro Valle Antigorio Val Formazza Val Vigezzo Valsesia Val Mastallone Val d'Otro Val Vogna...

Valdobbia, the Valdobbia Pass. Val Vogna opens west of Riva Valdobbia as a tributary of the Sesia Valley, with Val d'Otro north and Valle Artogna south...