The calculated distance (air line) between Bochum-Hordel and Opmeer is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Opmeer is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Opmeer has been calculated here.
Air line (approximately)
203 kilometers
109 nautical miles