The calculated distance (air line) between Bochum and 's-Gravenwezel is approximately 116 miles respectively 186 kilometers.
By car or train, the actual journey to 's-Gravenwezel is certainly longer, as only the direct route (as the crow flies) between Bochum and 's-Gravenwezel has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles