The calculated distance (air line) between Nong Kung Si and Kaeng Khro is approximately 79 miles respectively 126 kilometers.
By car or train, the actual journey to Kaeng Khro is certainly longer, as only the direct route (as the crow flies) between Nong Kung Si and Kaeng Khro has been calculated here.
Air line (approximately)
126 kilometers
68 nautical miles