The calculated distance (air line) between Garoua Boulaï and Ngaoundéré is approximately 120 miles respectively 193 kilometers.
By car or train, the actual journey to Ngaoundéré is certainly longer, as only the direct route (as the crow flies) between Garoua Boulaï and Ngaoundéré has been calculated here.
Air line (approximately)
193 kilometers
104 nautical miles