The calculated distance (air line) between Mertule Maryam and Debre Birhan is approximately 117 miles respectively 189 kilometers.
By car or train, the actual journey to Debre Birhan is certainly longer, as only the direct route (as the crow flies) between Mertule Maryam and Debre Birhan has been calculated here.
Air line (approximately)
189 kilometers
102 nautical miles