Aberystruth is an ancient parish in the north-west corner of Monmouthshire against the border with Brecknockshire. It forms the westernmost part of the Abergavenny Hundred and lies between the Monmouthshire parishes of Bedwellty to the west and Trevethin to the east. It extends from Beaufort in the north beyond Abertillery in the south.
It has a population of 27,386 in the following towns and villages:
The 19th century settlement of Brynmawr spans the boundary of the parishes of Aberystruth (Monmouthshire) and Llanelly and Llangattock (Brecknockshire). At the southern end of Boundary Street in Brynmawr you may still find the Boundary Stone marking the point where the three parishes meet.
- Monmouthshire parish map
- Rev. Edmund Jones. A Geographical, Historical, and Religious Account of the parish of Aberystruth in the county of Monmouth. printed by The Family at Trevecka 1779
- A history of St Peter's church Blaina
- Brynmawr Heritage Trail, Blaenau Gwent County Borough Council