The Ring of Brodgar, sometimes called the Ring of Brogar, is a stone circle superbly located on land rising above the saltwater Loch of Stenness and the freshwater Loch of Harray. When first erected there were 60 stones here, in a perfect circle 104m in diameter. Today just 36 of the original stones are still standing, and one of those only just, having been split vertically by a bolt of lightning on 5 June 1980.

The ring of stones is surrounded by a ditch cut into the rock that was 6m wide and 3m deep. There are entrance causeways across the ditch on the north-west side and on the south-east-side