The calculated distance (air line) between Reggio nell'Emilia and Viareggio is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Viareggio is certainly longer, as only the direct route (as the crow flies) between Reggio nell'Emilia and Viareggio has been calculated here.
Air line (approximately)
97 kilometers
53 nautical miles