Viarigi is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 50 kilometres (31 mi) east of Turin and about 15 kilometres (9 mi) northeast of Asti.

Viarigi borders the following municipalities: Altavilla Monferrato, Felizzano, Montemagno, Quattordio, and Refrancore.

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