Yukon River. Aerial photograph of the Yukon River in central Alaska, USA, showing its braided river system. Braiding occurs in a river when it splits into a number of shallow channels which diverge and reunify along its course. Braiding occurs because of uneven deposition of the sediment that a river carries. The Yukon is 3185 kilometres long, rising in Canada. It flows as a braided system for about 240 kilometres through an area known as the Yukon Flats.
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