The calculated distance (air line) between Gonder and Ādīs Zemen is approximately 40 miles respectively 64 kilometers.
By car or train, the actual journey to Ādīs Zemen is certainly longer, as only the direct route (as the crow flies) between Gonder and Ādīs Zemen has been calculated here.
Air line (approximately)
64 kilometers
34 nautical miles