The calculated distance (air line) between Sassuolo and Reggio nell'Emilia is approximately 13 miles respectively 21 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 Sassuolo and Reggio nell'Emilia has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles