 BCGNIS defines the northern boundary of the Okanagan Range as Young Creek and the lower Ashnola River.Peakbagger.com defines the Okanogan Range as a much larger region bounded to the south by the Methow River and to the east by the Okanagan River and Similkameen River.The Okanagan Range should not be confused with the Okanagan Highland, which is located on the farther side of the Okanagan Valley and is sometimes classified as part of the Monashee Mountains.