The ridge, reaching to 2,700 feet, continues to the west where is is broken at Sentinel Gap (a water gap through which the Columbia River passes) before ending in the foothills of the Cascade Mountains.
The ridge, reaching to 2,700 feet, terminates in the east soouth of Othello, Washington near the foot of the Drumheller Channels. It continues to the west where is is broken at Sentinel Gap (a water gap through which the Columbia River passes) before ending in the foothills of the Cascade Mountains.