The calculated distance (air line) between Fereydūnshahr and Fārsān is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Fārsān is certainly longer, as only the direct route (as the crow flies) between Fereydūnshahr and Fārsān has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles