The calculated distance (air line) between Bochum-Hordel and Katwijk aan den Rijn is approximately 127 miles respectively 204 kilometers.
By car or train, the actual journey to Katwijk aan den Rijn is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Katwijk aan den Rijn has been calculated here.
Air line (approximately)
204 kilometers
110 nautical miles