The calculated distance (air line) between Uitenhage and Graaff-Reinet is approximately 116 miles respectively 186 kilometers.
By car or train, the actual journey to Graaff-Reinet is certainly longer, as only the direct route (as the crow flies) between Uitenhage and Graaff-Reinet has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles