The calculated distance (air line) between Seka and Nakhon Phanom is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to Nakhon Phanom is certainly longer, as only the direct route (as the crow flies) between Seka and Nakhon Phanom has been calculated here.
Air line (approximately)
105 kilometers
56 nautical miles