The calculated distance (air line) between Kiel and Mittegroßefehn is approximately 123 miles respectively 198 kilometers.
By car or train, the actual journey to Mittegroßefehn is certainly longer, as only the direct route (as the crow flies) between Kiel and Mittegroßefehn has been calculated here.
Air line (approximately)
198 kilometers
107 nautical miles