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
Church Island (Menai Strait) the two World Wars. This is also the best place on the island from which to view the Menai Strait and the two bridges that cross it. In 2002, little egrets bred in Wales for the first time on a small islet just off Church Island. Church Island (Menai Strait) Church Island () is a small island in the Menai Strait on the shores of Anglesey to which it is attached by a short causeway that is reachable only on foot off the Belgian Promenade. The whole of the island is taken up with St Tysilio's church, constructed in the