The calculated distance (air line) between Osternienburger Land and Gräfenhainichen is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Gräfenhainichen is certainly longer, as only the direct route (as the crow flies) between Osternienburger Land and Gräfenhainichen has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles