The Lillooet Ranges are approximately 8100 square kilometres (3150 mi²) in area. The range is extremely rugged and varied in terrain, and includes some of the highest peaks in southwestern British Columbia. The highest is Skihist Mountain, , crowning the Cantilever Range in the heart of the area to the west of the community of Lytton at the confluence of the Thompson and Fraser Rivers. The northernmost subdivision of the Lillooet Ranges is the Cayoosh Range, which includes the second-highest summit in the Lillooet Ranges, an unnamed peak just south of Seton Lake and about WSW of the town of Lillooet. To the northeast of Harrison Lake, Mount Breakenridge stands tall and poses a significant local landslide tsunami risk to the area.