The calculated distance (air line) between Castellarano and Reggio nell'Emilia is approximately 13 miles respectively 22 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 Castellarano and Reggio nell'Emilia has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles