The Ring of Brodgar (or Brogar, or Ring o' Brodgar) is a Neolithic henge and stone circle about 6 miles north-east of Stromness on Mainland, the largest island in Orkney, Scotland. It is part of the UNESCO World Heritage Site known as the Heart of Neolithic Orkney. General information The Ring of Brodgar (or Brogar, or Ring o' Brodgar) is a Neolithic henge and stone circle in Mainland, Orkney, Scotland. It is the only major henge and stone circle in Britain which is an almost perfect circle. Most henges do not contain stone circles; Brodgar is a striking exception, ranking with Avebury and Stonehenge among the greatest of such sites. The ring of stones stands on a small isthmus between the Lochs of Stenness and Harray. These are the northernmost examples of circle henges in Britain. Unlike similar structures such as Avebury, there are no obvious stones inside the circle, but since the interior of the circle has never been excavated by archaeologists, the possibility remains that wooden structures, for example, may have been present. The site has resisted attempts at scientific dating and the monument's age remains uncertain. It is generally thought to have been erected between 2500 BC and 2000 BC, and was, therefore, the last of the great Neolithic monuments built on the Ness. A project called The Ring of Brodgar Excavation 2008 was undertaken in the summer of that year in an attempt to settle the age issue and help answer other questions about a site that remains relatively poorly understood. The results of the excavation are still preliminary. The stone circle is in diameter, and the third largest in the British Isles. The ring originally comprised up to 60 stones, of which only 27 remained standing at the end of the 20th century. The tallest stones stand at the south and west of the ring, including the "Comet Stone" to the south-east. The stones are set within a circular ditch up to deep, wide and in circumference that was carved out of the solid sandstone bedrock by the ancient residents. Technically, this ditch does not constitute a true henge as there is no sign of an encircling bank of earth and rock. Many archaeologists continue to refer to this structure as a henge; for example, Aubrey Burl classifies the ditch as a Class II henge; one that has two opposing entrances, in this case on