San Martino in Rio (Reggiano: ) is a comune (municipality) in the Province of Reggio Emilia in the Italian region Emilia-Romagna, located about northwest of Bologna and about northeast of Reggio Emilia. Remarkable the church of San Carlo Borromeo. As of 31 December 2024 San Martino in Rio had an estimated population of 8,218.
San Martino in Rio borders the following municipalities: Campogalliano, Correggio, Reggio Emilia, Rubiera.
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