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Wikipedia has a page about River Wharfe
The River Wharfe is a river in Yorkshire, England. For much of its length it is the county boundary between West Yorkshire and North Yorkshire. The name Wharfe derives from the Old English 'weorf' or Old Norse 'hverfr' and means "winding river".
The valley of the River Wharfe is known as Wharfedale. The river source is at Beckermonds, Langstrothdale in the Yorkshire Dales National Park and flows through Kettlewell, Grassington, Bolton Abbey, Addingham, Ilkley, Burley-in-Wharfedale, Otley, Wetherby and Tadcaster. It then flows into the River Ouse near Cawood. The section of the river from its source to around Addingham is known as Upper Wharfedale and has a very different character to the river downstream.
The river is approximately 97 km long before it joins the River Ouse. It is a public navigation from the weir at Tadcaster to its junction with the River Ouse near Cawood and tidal from Ulleskelf.