The calculated distance (air line) between Giardini-Naxos and Reggio Calabria is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Reggio Calabria is certainly longer, as only the direct route (as the crow flies) between Giardini-Naxos and Reggio Calabria has been calculated here.
Air line (approximately)
47 kilometers
25 nautical miles