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
Middle Mouse Middle Mouse Middle Mouse ( - "Patrick's island") is an uninhabited island situated 1 kilometre off the north coast of Anglesey. It is notable as the northernmost point of Wales. The island measures a maximum of 207 metres by 110 metres, with a maximum area of 3.7 acres and has a maximum altitude of 16 metres above sea level. It is one of a chain of three islands off the north of Anglesey, the others being Ynys Amlwch and Maen y Bugail. Local legend has it that St Patrick was shipwrecked there, giving rise to its Welsh name. He then