Quarna Sotto is a comune (municipality) in the Province of Verbano-Cusio-Ossola in the Italian region Piedmont, located about 100 kilometres (62 mi) northeast of Turin and about 15 kilometres (9 mi) southwest of Verbania.

Quarna Sotto borders the following municipalities: Nonio, Omegna, Quarna Sopra, Valstrona, Varallo Sesia.

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