Gill (stream)
Gill or Ghyll is used for a ravine or narrow valley in the North of England and other parts of the United Kingdom. The word originates from the Old Norse Gil. Examples include Dufton Ghyll Wood, Dungeon Ghyll, Troller's Gill, Brockma Gill and Trow Ghyll. As a related usage, Gaping Gill is the name of a cave, not the associated stream, and Cowgill, Masongill and Halton Gill are derived names of villages.