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
Puffin Island (Anglesey) Puffin Island (Anglesey) Puffin Island () (at or ) is an uninhabited island off the eastern tip of Anglesey, Wales. It was formerly known as Priestholm in English and Ynys Lannog in Welsh. A hermitage was established here around the 6th century and there are remains of a 12th-century monastery on the island. The island is also a Special Protection Area for wildlife. Puffin Island is the ninth largest island off the coast of Wales and marks the northeastern end of the Menai Strait. Puffin Island's highest point is Carboniferous limestone, at above sea level having steep cliffs on all