The Encyclopedia Americana (1920)/Hay River
HAY RIVER, a stream which rises in the
Rocky Mountains in Athabasca, Canada, and
flows northeast into Great Slave Lake. It is
navigable for about 140 miles from its mouth;
its entire length is about 360 miles. The two
Alexandra Falls (named after Princess
Alexandra, now Queen Alexandra of England) are
found in the upper course; they average about
250 feet in height and 900 feet in width.