“ GREAT FISH, or BACK, RIVER. A river of Mackenzie and Keewatin, Dominion of Canada, rising in a small lake near the north shore of Lake Aylmer (Map: Canada, K 9) . It flows through lakes Beechy, Pelley, and Garry, and enters the Arctic Ocean by a wide estuary, off the entrance to which is King William Land, after a northeast course of about 500 miles. ”