The Western Light is a lighthouse aptly located on the northernmost part of Ancelstierre’s west coast. It stands inside Perimeter and has a counterpart on the east coast. Despite its location, the lighthouse is run by the Royal Ancelstierran Navy instead of the Army, with responsibility given to the Keeper of the Western Light. In Abhorsen, this post is occupied by one Lieutenant Drewe.
Because modern technology often fails close to the Wall, the lighthouse has a dual lighting system – one electric, the other, oil and clockwork. The lenses used are "the best lenses ever ground by the glass masters of Corvere."