Location and coordinates are for the approximate centre of Merthyr Mawr within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Merthyr-Mawr, par. and vil., Glamorgan, on river Ogwr, 2 miles SW. of Bridgend, 2262 ac. and 19 tidal water and 422 foreshore, pop. 120; P.O.; in vicinity of vil. is Merthyr-Mawr House, seat.