The calculated distance (air line) between Decima and Reggio nell'Emilia is approximately 29 miles respectively 47 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 Decima and Reggio nell'Emilia has been calculated here.
Air line (approximately)
47 kilometers
26 nautical miles