Castleruddery Stone Circle is 30 m (98 ft) in diameter. It is composed of 29 stones, some of which are decorated with cup marks. The circle has two enormous white quartzportal stones at the entrance, each weighing at least 15 tons. The circle itself is surrounded by an embankment about 1.2 m (3 ft 11 in) high. The 4.5 m (15 ft) metre wide bank has an opening in the east.[6]