Bosio is a comune in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres southeast of Turin and abou…Bosio is a comune in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres southeast of Turin and about 35 kilometres southeast of Alessandria. Bosio borders the following municipalities: Campo Ligure, Campomorone, Casaleggio Boiro, Ceranesi, Gavi, Genoa, Lerma, Masone, Mele, Mornese, Parodi Ligure, Rossiglione, Tagliolo Monferrato, and Voltaggio.