The calculated distance (air line) between Az̧ Z̧āhirīyah and Jabālyā is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Jabālyā is certainly longer, as only the direct route (as the crow flies) between Az̧ Z̧āhirīyah and Jabālyā has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles