The calculated distance (air line) between Bāndarban and Nārāyanganj is approximately 147 miles respectively 236 kilometers.
By car or train, the actual journey to Nārāyanganj is certainly longer, as only the direct route (as the crow flies) between Bāndarban and Nārāyanganj has been calculated here.
Air line (approximately)
236 kilometers
127 nautical miles