The calculated distance (air line) between Bochum and Katwijk aan den Rijn is approximately 129 miles respectively 208 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 and Katwijk aan den Rijn has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles