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 Stack Walls and Wen Zawn, provide one of the largest ranges of rock climbs in Britain, such as "A Dream of White Horses", "The Cad" and "The Bells! The Bells!" The climbing areas at North Stack have been documented since the 1970s in a series of local guidebooks. Leading climbers such as Paul Pritchard have put up many extreme new routes.
- The main island of 'Ynys Arw' which gave its name to the peninsula (or headland)
- Headland cliffs
- North Stack headland
- North Stack: the small island at the end of Gogarth Bay and the headland opposite
- Trinity House Magazine, North Stack
- "Holyhead Mountain, North Stack to Penrhyn Mawr", ccw.gov.uk. Retrieved 31 December 2010.
- North Stack, holyhead.com. Retrieved 31 December 2010.
- "Artist profile: Philippa Jacobs", bbc.co.uk, Retrieved 31 December 2010.
- Gogarth North Stack (North Stack Wall), ukclimbing.com. Retrieved 31 December 2010.
- Gogarth North Stack (Wen Zawn), ukclimbing.com. Retrieved 31 December 2010.
- Panton, Simon (2015). Gogarth North. Llanberris, Wales: GroundUp. ISBN 978-0-9554417-1-4.
- "Anglesey World War II plane tragedy memorial service to be held on 70th anniversary, daily.co.uk, Retrieved 17 December 2014.