 Beneath Keld Head, it changes its name to the River Twiss.It has two notable waterfalls, Thornton Force and Pecca Falls, and its course follows part of the Ingleton Waterfalls Walk, then through Swilla Glen to Thornton in Lonsdale and down to Ingleton, where it meets the River Doe to form the River Greta.The English landscape artist J. M. W. Turner was a frequent visitor to the area and his sketch of Thornton Force in 1816 is currently part of the Tate collection.