The calculated distance (air line) between Chhāgalnāiya and Uttar Char Fasson is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Uttar Char Fasson is certainly longer, as only the direct route (as the crow flies) between Chhāgalnāiya and Uttar Char Fasson has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles