The calculated distance (air line) between Piazza and Reggio nell'Emilia is approximately 57 miles respectively 92 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 Piazza and Reggio nell'Emilia has been calculated here.
Air line (approximately)
92 kilometers
49 nautical miles