Parc Cenedlaethol Bannau Brycheiniog). The village is split in two into Upper Brynamman and Lower Brynamman by the River Amman which also acts as the boundary between the counties of Carmarthenshire and Neath Port Talbot (the old county of Glamorganshire). Ruins of stone dwellings (possibly prehistoric), an early type of lime kiln and rectangular medieval buildings found on the mountain show that man has lived in this area for a long time.