Ystradgynlais

borough in Pennsylvania, United States of America

Ystradgynlais (; ) is a town in southwest Powys, Wales. It is located on the River Tawe, and was within the boundaries of the former county of Brecknockshire. The town has a high proportion of Welsh language-speakers. The community includes Cwmtwrch, Abercraf and Cwmgiedd, with a population of 8,092 in the 2011 census; it is the second-largest town in Powys. It forms part of the Swansea Urban Area where the Ystradgynlais subdivision has a population of 10,248.

thumb|Abercrave Inn Abercraf (also ; or Abercrave) is a village in Powys, Wales, in the community of Ystradgynlais and within the historic boundaries of the county of Brecknockshire.