Brynamman is a village on the south side of the Black Mountain, part of the Brecon Beacons National Park. The village is split into Upper Brynamman and Lower Brynamman by the River Amman, which is also the boundary between the counties of Carmarthenshire and Neath Port Talbot. Ruins of stone dwellings, an early type of lime kiln and rectangular medieval buildings found on the mountain show that people have lived in this area for a long time. The population of Brynamman was 2,608 as of 2011; the urban area including Gwaun-Cae-Gurwen was 5,692.