The calculated distance (air line) between Collecchio and Reggio nell'Emilia is approximately 21 miles respectively 33 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 Collecchio and Reggio nell'Emilia has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles