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Lange Anna ("Long Anna" or "Tall Anna"), is a 47 metres (154 ft) high sea stack of Buntsandstein in the North Sea island of Helgoland, Germany. Formerly it was also known as Hengst or Mönch, but its real local name is Nathurn Stak (Northern Stack). Climbing the stack is not allowed but tourists can look at the rock from a distance.
- Maren Lindstaedt, Thomas Kersten: Ein virtueller Klon für Helgolands Lange Anna durch terrestrisches Laserscanning. In: Thomas Luhmann (Hrsg.): Photogrammetrie, Laserscanning, Optische 3D-Messtechnik – Beiträge der 4. Oldenburger 3D-Tage 2005. Wichmann-Verlag, Heidelberg, ISBN 978-3-87907-420-4 [Amazon-US | Amazon-UK], S. 216-223.