The calculated distance (air line) between Ottendorf-Okrilla and Schwarzheide is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Schwarzheide is certainly longer, as only the direct route (as the crow flies) between Ottendorf-Okrilla and Schwarzheide has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles