The Callanish VIII stone setting is one of many megalithic structures around the better-known Calanais I on the west coast of the isle of Lewis, in the Outer Hebrides (Western Isles), Scotland. It is also known locally as Tursachan.
This is a very unusual (and possibly unique) setting, with a semicircle of four large stones on the edge of a cliff on the south of the island of Great Bernera and looking across a narrow strait to Lewis. There is no evidence that the cliff has collapsed here and destroyed half of a complete circle - it would appear that a semicircle was the original intention. The tallest stone is nearly three metres high and the cliff-edge axis of the circle gives a diameter of about 20 metres.