The calculated distance (air line) between Castano Primo and Reggio nell'Emilia is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Reggio nell'Emilia is certainly longer, as only the direct route (as the crow flies) between Castano Primo and Reggio nell'Emilia has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles