Illecillewaet (ĭləsĭlˈəwĕt, –wāt) [key], mountain stream, c.50 mi (80 km) long, rising in Illecillewaet glacier on the west slope of the Selkirk Mts., SE British Columbia, Canada. It flows southwest in a mountain valley to join the Columbia River near Revelstoke. For almost its entire distance it is followed by the Canadian Pacific Railway and is well known to travelers for its exceptional beauty.
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