The calculated distance (air line) between Phnom Penh and Tây Ninh is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Tây Ninh is certainly longer, as only the direct route (as the crow flies) between Phnom Penh and Tây Ninh has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles