The Commission has determined that a county constituency be created from:The Cardiff West UK Parliamentary constituency,and:The Cardiff South and Penarth UK Parliamentary constituency.
Mae’r Comisiwn wedi penderfynu creu etholaeth sirol o’r canlynol:Etholaeth Seneddol y Deyrnas Unedig Gorllewin Caerdydd,ac:Etholaeth Seneddol y Deyrnas Unedig De Caerdydd a Phenarth.