The calculated distance (air line) between Montero and Ascención de Guarayos is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Ascención de Guarayos is certainly longer, as only the direct route (as the crow flies) between Montero and Ascención de Guarayos has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles