The River Nidd is a river located in North Yorkshire, England. It flows for approximately 30 miles, starting in the Nidderdale area and eventually joining the Ouse near York. The river is known for its scenic beauty and is popular for various outdoor activities, including fishing and walking along its banks. The River Nidd passes through several towns, including Pateley Bridge and Knaresborough. It is also home to diverse wildlife and supports various ecosystems. The river's waters are primarily fed by rainfall and contribute to the region's agriculture and natural landscapes.