The calculated distance (air line) between Tarquinia and Reggio nell'Emilia is approximately 178 miles respectively 287 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 Tarquinia and Reggio nell'Emilia has been calculated here.
Air line (approximately)
287 kilometers
155 nautical miles