The Commission has determined that a county constituency be created from:The Aberafan Maesteg UK Parliamentary constituency,and:The Rhondda and Ogmore UK Parliamentary constituency.
Mae’r Comisiwn wedi penderfynu creu etholaeth sirol o’r canlynol:Etholaeth Seneddol y Deyrnas Unedig Aberafan Maesteg,ac:Etholaeth Seneddol y Deyrnas Unedig Rhondda ac Ogwr.