The calculated distance (air line) between Doembang Nangbuat and Si Racha is approximately 127 miles respectively 205 kilometers.
By car or train, the actual journey to Si Racha is certainly longer, as only the direct route (as the crow flies) between Doembang Nangbuat and Si Racha has been calculated here.
Air line (approximately)
205 kilometers
111 nautical miles