The calculated distance (air line) between That Phanom and Nong Wua So is approximately 142 miles respectively 229 kilometers.
By car or train, the actual journey to Nong Wua So is certainly longer, as only the direct route (as the crow flies) between That Phanom and Nong Wua So has been calculated here.
Air line (approximately)
229 kilometers
123 nautical miles