The calculated distance (air line) between Panghyŏn-dong and Hamhŭng is approximately 122 miles respectively 196 kilometers.
By car or train, the actual journey to Hamhŭng is certainly longer, as only the direct route (as the crow flies) between Panghyŏn-dong and Hamhŭng has been calculated here.
Air line (approximately)
196 kilometers
106 nautical miles