Cahergal Stone Fort - An Chathair Gheal

Cahergal - An Chathair Gheal stone fort is in County Kerry, Ireland (Irish: Contae Chiarraí, Éire). It was  built around 600AD and is located immediately southeast of another stone fort Leacanabuaile (Irish:Leaca na Buaile) and about 2.7 km (1.7 mi) northwest of the town of Cahirciveen (Irish: Cathair Saidhbhín). This site dry stone wall fort has undergone some reconstruction and the outer walls are approximately 4m (13ft) high and about 5 m (16ft) thick. It has an internal diameter 25 m (82 ft).

Image: Courtesy of Commons Wikipedia https://commons.wikimedia.org/wiki/File:Cahergall_Cashel_interior.JPG

Link: The Ring of Kerry Cahergal and Leacanabuaile - Old Irish Stone Forts or Ring Forts.