The calculated distance (air line) between Gounou Gaya and N'Djamena is approximately 174 miles respectively 280 kilometers.
By car or train, the actual journey to N'Djamena is certainly longer, as only the direct route (as the crow flies) between Gounou Gaya and N'Djamena has been calculated here.
Air line (approximately)
280 kilometers
151 nautical miles