The calculated distance (air line) between Manikchari and Nārāyanganj is approximately 100 miles respectively 162 kilometers.
By car or train, the actual journey to Nārāyanganj is certainly longer, as only the direct route (as the crow flies) between Manikchari and Nārāyanganj has been calculated here.
Air line (approximately)
162 kilometers
87 nautical miles