Collagna
Collagna is a frazione of the comune of Ventasso in the Province of Reggio Emilia in the Italian region Emilia-Romagna, located about west of Bologna and about southwest of Reggio Emilia. It was a separate comune until 1 January 2016, when it was merged with Busana, Ligonchio and Ramiseto.
Collagna borders the Tuscan municipalities of Comano, Fivizzano and the former municipality of Sillano.