The calculated distance (air line) between Duisburg and Montignies-sur-Sambre is approximately 122 miles respectively 196 kilometers.
By car or train, the actual journey to Montignies-sur-Sambre is certainly longer, as only the direct route (as the crow flies) between Duisburg and Montignies-sur-Sambre has been calculated here.
Air line (approximately)
196 kilometers
106 nautical miles