The calculated distance (air line) between Ādīs ‘Alem and Debre Birhan is approximately 89 miles respectively 144 kilometers.
By car or train, the actual journey to Debre Birhan is certainly longer, as only the direct route (as the crow flies) between Ādīs ‘Alem and Debre Birhan has been calculated here.
Air line (approximately)
144 kilometers
77 nautical miles