The calculated distance (air line) between Oshnavīyeh and Ṟuwandiz is approximately 43 miles respectively 70 kilometers.
By car or train, the actual journey to Ṟuwandiz is certainly longer, as only the direct route (as the crow flies) between Oshnavīyeh and Ṟuwandiz has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles