The calculated distance (air line) between Mawlamyinegyunn and Nyaunglebin is approximately 145 miles respectively 234 kilometers.
By car or train, the actual journey to Nyaunglebin is certainly longer, as only the direct route (as the crow flies) between Mawlamyinegyunn and Nyaunglebin has been calculated here.
Air line (approximately)
234 kilometers
126 nautical miles