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The River Nidd is a tributary of the River Ouse in North Yorkshire. The Yorkshire Dales Rivers Trust YDRT has a remit to conserve the ecological condition of the river Nidd from its headwaters to the Humber estuary. The river gets its name for the Celtic word for brilliant.
The upper river valley, Nidderdale, was designated an Area of Outstanding Natural Beauty in 1994.
The river is 95 Km long.
Wikipedia: Link

The River Ouse is formed by the junction of the River Ure and River Swale. The river flows south through York to its junction with the River Trent, where it becomes the Humber. Total length of the river is 52 miles (100 miles for the combined Ouse/Ure). The Ouse's tributaries (which includes the Derwent, Aire, Don, Wharfe, Rother, Nidd, Swale, Ure, and Foss) drains a large upland area of Northern England, including much of the Yorkshire Dales and North York Moors.
Wikipedia: Link