The calculated distance (air line) between Sīnah and Oshnavīyeh is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Oshnavīyeh is certainly longer, as only the direct route (as the crow flies) between Sīnah and Oshnavīyeh has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles