“The cairn is aligned WNW-ESE and includes a partly scrub covered mound of stones up to 2m high and measuring 45m along its long axis by a maximum of 22.5m wide. It is wedge shaped in plan with the wider end to the east, where there is a hollow thought to be the site of a collapsed megalithic chamber. Two indentations about halfway along the cairn’s long sides are thought to represent the position of two further megalithic chambers.”
From’t RSM