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Other current and historical names
Location and coordinates are for the approximate centre of Trefil within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Trevil, hamlet with ry. sta., Monmouthshire, on border of co., 2¾ miles W. of Brynmawr.