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