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
North West Island included as part of Capricornia Cays National Park in 1980. In September 2009, Jacob Lollback died while spearfishing off North West Island. In mid April 2010, it was suspected that the 2010 Great Barrier Reef oil spill had reached North West Island. Small globules of oil were found along a 1 km long section of a beach. Clean-up crews were removing the oil by 14 April. A Maritime Safety Queensland spokesperson doubted the oil could have arrived on the island from the MV Shen Neng 1 so quickly, claiming the oil was from an earlier spill. The vegetation of the