The Lonk is a domestic sheep of a specific breed, found in the hills of the central and south Pennines, in the north of England. The name "Lonk" derives from the Lancashire word "lanky", meaning long and thin, usually in a person. Their range extends into only three counties; Lancashire, Yorkshire and Derbyshire. Also known as the Improved Haslingden, the Lonk is of the Blackfaced Mountain type, and is similar to the Derbyshire Gritstone, apart from the absence of horns in that breed.