Seppiana  Seppiana was a "comune" (municipality) in the Province of Verbano-Cusio-Ossola in the Italian region Piedmont, located about northeast of Turin and about northwest of Verbania. As of 31 December 2004, it had a population of 176 and an area of . On 1 January 2016 the municipalities of Seppiana and Viganella merged into the municipality of Borgomezzavalle. Seppiana bordered the following municipalities: Calasca-Castiglione, Montescheno, Pallanzeno, Viganella, Villadossola.