The calculated distance (air line) between Siem Reab and Phumĭ Tnaôt is approximately 109 miles respectively 175 kilometers.
By car or train, the actual journey to Phumĭ Tnaôt is certainly longer, as only the direct route (as the crow flies) between Siem Reab and Phumĭ Tnaôt has been calculated here.
Air line (approximately)
175 kilometers
94 nautical miles