 Behind them is Wahleach Lake, which begins at the east foot of Cheam and lies in a high-altitude valley ringed by the Cheam Range.The far east ridge of Cheam is not alpine and is heavily forested and is pierced by the BC Hydro diversion tunnel to Wahleach Powerhouse, which is in the area of the Trans-Canada Highway that Cheam first becomes visible coming from the east.A few miles east along the highway the highway's course diverts around the foot of another mountain.