Most northern regions and islands had a Thing or Ting place and in Sacred Number the geomantic art of defining such a centre was shown to be geometrical and often-times oriented to the Earth's pole. For an introduction to this Scandinavian tradition see this Wikipedia entry.
One of the more beautiful pictures produced but not used for the book was of Shetland, using Google Earth and Visio:
Further details can be found in John Michell's At the Centre of the World: Polar Symbolism Discovered in Celtic, Norse and Other Ritualized Landscapes Thames & Hudson Ltd (May 1994)
The Shetland Museum Service has the photo left of Law Ting Holm, as it would have been before the loch waters were lowered. On the north-south axis, the photo is looking south.