Merthyr Mawr is a village and community (or civil parish) in Bridgend County Borough, Wales. The village is about 2½ miles from the centre of Bridgend town. The community occupies the area west of the Ewenny River, between Bridgend and Porthcawl. Since the introduction of Bridgend County Borough it takes in the settlement of Tythegston and a stretch of coastal sand dunes known as Merthyr Mawr Warren.
The first three maps are provided by A Vision of Britain through Time
These maps were found on Wikimedia Commons
These maps of Glamorgan post-1974 were found on another site and are very useful for sorting out the up-to-date geography of the area