The calculated distance (air line) between Dallgow-Döberitz and Marienthal is approximately 142 miles respectively 229 kilometers.
By car or train, the actual journey to Marienthal is certainly longer, as only the direct route (as the crow flies) between Dallgow-Döberitz and Marienthal has been calculated here.
Air line (approximately)
229 kilometers
124 nautical miles