The region is located in the middle of the state with the Cascades to the west dividing the state from north to south, and the smaller Ochoco Mountains to the east. Portions of the region are part of a basalt plateau formed by the Columbia River Basalt Group, others are part of the slopes of the Cascades, and others part of the Basin and Range. The climate of the area is primarily arid due to the rain shadow effect of the Cascades on the western boundary of the region. Outdoor recreational activities, timber, and ranching are the primary economic activities.