The calculated distance (air line) between Treinta y Tres and Barros Blancos is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Barros Blancos is certainly longer, as only the direct route (as the crow flies) between Treinta y Tres and Barros Blancos has been calculated here.
Air line (approximately)
225 kilometers
122 nautical miles