The calculated distance (air line) between Mönchengladbach and Tönisvorst is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Tönisvorst is certainly longer, as only the direct route (as the crow flies) between Mönchengladbach and Tönisvorst has been calculated here.
Air line (approximately)
16 kilometers
8 nautical miles