The calculated distance (air line) between Treviolo and Reggio nell'Emilia is approximately 84 miles respectively 135 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 Treviolo and Reggio nell'Emilia has been calculated here.
Air line (approximately)
135 kilometers
73 nautical miles