North Stack North Stack North Stack (Welsh: Ynys Arw, meaning "rugged island") is a small island situated just off Holy Island on the north-west coast of Anglesey. North Stack can also refer to the headland opposite the island. This is the site of a redundant fog warning station, comprising a number of buildings, including the Trinity House Magazine, built in 1861, where shells for the warning cannon were stored. These buildings now house a bird watching observatory, giving a view of South Stack lighthouse across Gogarth Bay, and the studio of artist Philippa Jacobs. The Precambrian quartzite cliffs of this headland, including
West Mouse West Mouse West Mouse (Welsh: Maen y Bugail) is an islet lying off the north-west coast of Anglesey, Wales. Its maximum dimensions are , with an area of . It is located in an area of notoriously strong tides. Because of this, at least three shipwrecks lie near it, making it a popular diving location. There is now a white beacon on the island which is used as a navigational aid if lined up with two other beacons, one on the Anglesey mainland and another on Coal Rock, an islet a mile and a half north. The area also host