The calculated distance (air line) between Cotonou and Dassa-Zoumé is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Dassa-Zoumé is certainly longer, as only the direct route (as the crow flies) between Cotonou and Dassa-Zoumé has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles