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
South West Solitary Island South West Solitary Island South West Solitary Island or Groper Island is an island found off the New South Wales North coast and inside the continental shelf. It is located 18 km north-east of Coffs Harbour and about 18 km south-south-east of Woolgoolga. The island is part of the Solitary Islands Marine Park established 2 January 1998 and managed by the NSW Maritime Parks Authority. Rocks on South West Solitary Island consist of repeating beds of mudstone and sandstone. The sandstone is medium to coarse grained. Some beds are 5 to 10 cm thick, whereas others are up to 3