Troller's Gill is a limestone gorge, close to the village of Appletreewick in the Yorkshire Dales (grid reference SE068619). Legend has it that the Gill is the home of trolls, and the mythical monstrous black dog Barghest. Roger and the Rottentrolls is a fictional children's television program which takes the name of it's setting from Troller's Gill, however filming took place at Brimham Rocks, a short distance away.