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Side valley
A side valley and a tributary valley are valleys whose brook or river flows into a greater one.
Upstream, the valleys can be classified in an increasing order which is equivalent to the usual orographic order: the tributaries are ordered from those nearest to the source of the river to those nearest to the mouth of the river. A confluence is where two or more tributaries or rivers flow together.
==Orographic order (e.g. river Humber)==
In the orographic classification (order of rivers) the tributary river has order ''n+1'', if ''n'' describes the primary (or main) river. A river which flows directly into the ocean (e.g. the English rivers Thames or Humber) has the orographic order n=1, the River Ouse n=2, the Wharfe n=3 and so on.
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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