The calculated distance (air line) between Ranong and Nakhon Si Thammarat is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Nakhon Si Thammarat is certainly longer, as only the direct route (as the crow flies) between Ranong and Nakhon Si Thammarat has been calculated here.
Air line (approximately)
225 kilometers
121 nautical miles