The calculated distance (air line) between Az̧ Z̧āhirīyah and Idhnā is approximately 10 miles respectively 17 kilometers.
By car or train, the actual journey to Idhnā is certainly longer, as only the direct route (as the crow flies) between Az̧ Z̧āhirīyah and Idhnā has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles