The calculated distance (air line) between Dortmund and 's-Gravenwezel is approximately 126 miles respectively 204 kilometers.
By car or train, the actual journey to 's-Gravenwezel is certainly longer, as only the direct route (as the crow flies) between Dortmund and 's-Gravenwezel has been calculated here.
Air line (approximately)
204 kilometers
110 nautical miles