Finally, the Boundary Country, a southern east-west corridor between the Okanagan and the Bonanza Pass and drained by the basins of the Kettle and Granby Rivers, is sometimes mentioned as being in the West Kootenay, and in other reckonings as being part of the Okanagan. In actuality, the settlement of the Boundary Country predates development in either of the regions it is now attached to, as is also the case with the Similkameen Country to the west of the Okanagan. In some descriptions, the Boundary Country includes Osoyoos and Oliver in the South Okanagan (rather than the other way around). The Boundary Country is "(illustrated by h)" In the event of its inclusion, the Kootenays could be described as the complete Canadian portion of the Columbia Basin minus lands drained by the Okanagan River.