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