The calculated distance (air line) between Debre Tabor and Debre Sīna is approximately 182 miles respectively 293 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 Tabor and Debre Sīna has been calculated here.
Air line (approximately)
293 kilometers
158 nautical miles