The calculated distance (air line) between Debre Sīna and Debre Birhan is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Debre Birhan is certainly longer, as only the direct route (as the crow flies) between Debre Sīna and Debre Birhan has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles