The calculated distance (air line) between Rovinj and Gradisca d'Isonzo is approximately 56 miles respectively 91 kilometers.
By car or train, the actual journey to Gradisca d'Isonzo is certainly longer, as only the direct route (as the crow flies) between Rovinj and Gradisca d'Isonzo has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles