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Mackenzie River
The Mackenzie River (Slavey language: ''Deh-Cho'', ''big river'' or Inuvialuktun: ''Kuukpak'', ''great river'') is the largest and longest river system in Canada, and is exceeded only by the Mississippi River system in North America. It flows through a vast, isolated region of forest and tundra entirely within the country's Northwest Territories, although its many tributaries reach into four other Canadian provinces and territories. The river's mainstem runs in a northerly direction to the Arctic Ocean, draining a vast area nearly the size of Indonesia. It is the largest river flowing into the Arctic from North America, and with its tributaries is one of the longest rivers in the world.
==Course==
Rising out of the marshy western end of Great Slave Lake, the Mackenzie River flows generally west-northwest for about , passing the hamlet of Fort Providence. At Fort Simpson it is joined by the Liard River, its largest tributary, then swings towards the Arctic, paralleling the Franklin Mountains as it receives the North Nahanni River. The Keele River enters from the left about above Tulita, where the Great Bear River joins the Mackenzie. Just before crossing the Arctic Circle, the river passes Norman Wells, then continues northwest to merge with the Arctic Red and Peel rivers. It finally empties into the Beaufort Sea, part of the Arctic Ocean, through the vast Mackenzie Delta.〔〔Hodgins and Hoyle, p. 135〕
Most of the Mackenzie River is a broad, slow-moving waterway; its elevation drops just from source to mouth. It is a braided river for much of its length, characterized by numerous sandbars and side channels. The river ranges from wide and deep in most parts, and is thus easily navigable except when it freezes over in the winter. However, there are several spots where the river narrows to less than half a kilometre (0.3 mi) and flows quickly, such as at the Sans Sault Rapids at the confluence of the Mountain River and "The Ramparts", a deep canyon south of Fort Good Hope.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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