The calculated distance (air line) between Bochum-Hordel and Dordrecht is approximately 109 miles respectively 176 kilometers.
By car or train, the actual journey to Dordrecht is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Dordrecht has been calculated here.
Air line (approximately)
176 kilometers
95 nautical miles