Castell Abersoch;Castell Aber-Soch;Hen Gaer;Castellmarch

The National Monuments Record of Wales records Castell Abersoch;Castell Aber-Soch;Hen Gaer;Castellmarch as Defended Enclosure from the Unknown; Iron Age period. The saved point comes from the official national record. Inclusion does not by itself mean that the public may enter the place.

Castell Abersoch, also known as Hen Gaer or Castellmarch, is a ringfort or rath, likely dating to the early medieval period, though it may have origins in the Iron Age. It is associated with local folklore as a fairy fort, traditionally believed to be a dwelling place of the Tylwyth Teg, the Welsh fairies.