The calculated distance (air line) between Ouahigouya and Gorom-Gorom is approximately 158 miles respectively 255 kilometers.
By car or train, the actual journey to Gorom-Gorom is certainly longer, as only the direct route (as the crow flies) between Ouahigouya and Gorom-Gorom has been calculated here.
Air line (approximately)
255 kilometers
137 nautical miles