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.
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