Caer Castell is located on the edge of marshy ground within the grounds of St Illtyd's School. The mound measures about 45m in overall diameter its top once embanked to enclose an area of about 33m in diameter; this bank is now largely levelled. The mound is about 9m high above the marsh, 4m above the ditch on the north.
Some garden landscaping has recently been carried out in the north and east ditch areas but the site is otherwise covered in trees, shrubs and brambles.
Other sources:
OS record card ST28SW13.

David Leighton, RCAHMW, November 1988