Harrison Lake is the largest lake in the southern Coast Mountains of Canada, being about 250 square kilometres (95 mi2) in area. It is about 60 km (37 mi) in length and at its widest almost 9 km (5.6 mi) across. Its southern end, at the resort community of Harrison Hot Springs, is c. 95 km east of downtown Vancouver. East of the lake are the Lillooet Ranges while to the west are the Douglas Ranges. The lake is the last of a series of large north–south glacial valleys tributary to the Fraser along its north bank east of Vancouver, British Columbia. The others to the west are the Chehalis, Stave, Alouette, Pitt, and Coquitlam Rivers. Harrison Lake is a natural lake, not man-made. The lake is supplied primarily from the Lillooet River, which flows into the lake at the northernmost point.