On the south-east facing slopes of Pencreigiau'r Llan, between forestry plantations is a curvilinear bank defining an abandoned field enclosure. It encloses an area of approximately 0.2 hectares. It is bounded on the west and south by the course of a deep stream cutting, on the north by a broad curvilinear bank some 3m wide, up to 1.2m high and externally ditched, and on the east by a track from Anglers? Retreat to Llyn Penrhaeadr and beyond. On the north-east the bank fades close to the track on the opposite side of which is the corner of a forestry plantation. This suggests that the enclosure may have been part of a larger field system now obscured by forestry and truncated by the track.
The enclosure was once part of the abandoned holding of Nanthir, formerly about 1 ha. A building thus named is portrayed on a Gogerddan Estate map (1), dated 1788, located just inside the enclosure, shown hedged. However, its identity is annotated `old walls? suggesting abandonment by this date. No traces of the building were seen, and it is likely to have been destroyed by the formation of the trackway which now bissects the holding. Ordnance Survey map 1st edition 25? (1870s) portrays a `Stone? on the trackside at a point just north of the stream, perhaps the vestigial remains of the building.
The enclosure bank is transected by two roughly parallel leats at SN74929300, which follow a course towards Llyn Cornach and beyond.

(1) National Library of Wales, Gogerddan Estate Maps, vol.2; NLW vol.37, fol.32

David Leighton, RCAHMW, 22 April 2013