The calculated distance (air line) between Munster and Mittegroßefehn is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Mittegroßefehn is certainly longer, as only the direct route (as the crow flies) between Munster and Mittegroßefehn has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles