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Copper River (Alaska)
The Copper River or Ahtna River (), Ahtna Athabascan ‘Atna’tuu (), "river of the Ahtnas," Tlingit Eeḵhéeni (), "river of copper,"〔(【引用サイトリンク】url=http://www.omniglot.com/writing/tlingit.htm )〕 is a 290-mile (470 km) river in south-central Alaska in the United States. It drains a large region of the Wrangell Mountains and Chugach Mountains into the Gulf of Alaska.〔(【引用サイトリンク】url=https://books.google.com/books?id=T7UPAAAAIAAJ&q=It+drains+a+large+region+of+the+Wrangell+Mountains+and+Chugach+Mountains+into+the+Gulf+of+Alaska.&dq=It+drains+a+large+region+of+the+Wrangell+Mountains+and+Chugach+Mountains+into+the+Gulf+of+Alaska.&hl=en&sa=X&ei=ur2NVI3CIqnfsATNk4GYAQ&ved=0CCEQ6AEwAw )〕 It is known for its extensive delta ecosystem, as well as for its prolific runs of wild salmon, which are among the most highly prized stocks in the world. The river is the tenth largest in the United States, as ranked by average discharge volume at its mouth.〔(【引用サイトリンク】 publisher = USGS )〕
==Description==
The Copper River rises out of the Copper Glacier, which lies on the northeast side of Mount Wrangell, in the Wrangell Mountains, within Wrangell-Saint Elias National Park.〔(【引用サイトリンク】url=http://www.nps.gov/wrst/faqs.htm )〕 It begins by flowing almost due north in a valley that lies on the east side of Mount Sanford, and then turns west, forming the northwest edge of the Wrangell Mountains and separating them from the Mentasta Mountains to the northeast. It continues to turn southeast, through a wide marshy plain to Chitina, where it is joined from the southeast by the Chitina River (Ahtna Athabascan Tsedi Na' < ''tsedi'' "copper" + ''na’'' "river").〔 The Copper River is approximately long. It drops an average of about , and drains more than —an area the size of West Virginia.〔 The river runs at an average of .〔 Downstream from its confluence with the Chitina it flows southwest, passing through a narrow glacier-lined gap in the Chugach Mountains within the Chugach National Forest east of Cordova Peak.〔(【引用サイトリンク】url=http://www.nps.gov/wrst/planyourvisit/upload/Copper%20River%20Float.pdf )〕 There is an extensive area of linear sand dunes up to in height radiating from the mouth of the Copper River.〔(【引用サイトリンク】url=http://www.peakbagger.com/peak.aspx?pid=44168 )〕 Both Miles Glacier and Childs Glacier calve directly into the river.〔(【引用サイトリンク】url=http://www.alaskageographic.org/uploads/pdf/chugach-vg2014-web.pdf )〕 The Copper enters the Gulf of Alaska southeast of Cordova where it creates a delta nearly wide.〔
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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