The highest peak in BC, Fairweather Mountain (4,663 m), straddles the Alaska border in the St Elias Mountains just northwest of the Coast Mountains.
Only three major rivers have cut through the barrier of the Coast Mountains: the Fraser, Skeena and Stikine.
All of British Columbia was under a thick sheet of ice during the ice age.
Some coastal areas and interior valleys became ice-free about 12,000–15,000 years ago, and since then the coastal lowlands have been rising relative to sea level.
British Columbia is Canada's most westerly province, and is a mountainous area whose population is mainly clustered in its southwestern corner.
The northern end of the Cascade Mountains of Washington State terminates at the Fraser River, and then the high, snow and ice-covered peaks of the Coast Mountains extend northward along the Alaskan Panhandle into the Yukon.
The intense "Britishness" of earlier times is referred to in the province's name, which originated with Queen Victoria and was officially proclaimed in 1858.
Regions British Columbia has two main regions, often called "the Coast" and "the Interior." These two regions both have numerous contrasts and variations within them.
The fourth range of the group, the Cariboo Mountains northwest of the Thompson River, is composed of sedimentary rocks of Proterozoic age which appear to have fewer mineral deposits.
The Interior Plateau, made up of broad and gently rolling uplands, covers central British Columbia.