The region is named for Mount Waddington, which lies on its northeastern boundary and is the highest peak entirely within British Columbia (Fairweather Mountain, on the Alaska boundary, is the highest). Also within the regional district is Mount Silverthrone, the highest volcano in Canada, located in the remote Ha-Iltzuk Icefield. The eastern land boundary of the regional district is largely the divide of the Coast Mountains, inland from which is the Chilcotin District, which is part of the Cariboo Regional District. The northern land boundary with the Central Coast Regional District follows a watershed boundary, separating streams that flow into Queen Charlotte Sound north of Cape Caution from those that flow into the Sound to the south or that flow into Queen Charlotte Strait.