The calculated distance (air line) between Volterra and Reggio nell'Emilia is approximately 90 miles respectively 145 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 Volterra and Reggio nell'Emilia has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles