The calculated distance (air line) between Al Başrah al Qadīmah and Behbahān is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Behbahān is certainly longer, as only the direct route (as the crow flies) between Al Başrah al Qadīmah and Behbahān has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles