The calculated distance (air line) between Phnom Penh and Châu Đốc is approximately 61 miles respectively 98 kilometers.
By car or train, the actual journey to Châu Đốc is certainly longer, as only the direct route (as the crow flies) between Phnom Penh and Châu Đốc has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles