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Nizina River
Nizina River is the largest tributary of the Chitina River in the U.S. state of Alaska. It is located in the Wrangell–St. Elias National Park and Preserve.
==Geography==
The stream heads in Nizina Glacier, flows southward about to a point near the mouth of Dan Creek, where it takes an easterly course, which it follows for about to its junction with the Chitina. It drains an area of and is nearly as large as the Chitina at their junction. For the first of its course, it flows over a gravel flood plain from wide, bordered by steep-sloped mountains in height. At low water, it follows one or more constantly shifting channels. At medium stage, the number of channels increases, and finally at flood height, the entire flood plain becomes covered from bank to bank with swift-flowing, muddy water carrying large quantities of sand and gravel. Below Young Creek the bordering mountains are separated by a wider valley in which the river has cut a deep trench through the gravel and shale formations. Finally, for the last of its course, the river flows between walls of solid rock, forming a box canyon for much of the distance. The river has an average grade of about per mile.
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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