The Commission has determined that a county constituency be created from:The Monmouthshire UK Parliamentary constituency,and:The Torfaen UK Parliamentary constituency.
Mae’r Comisiwn wedi penderfynu creu etholaeth sirol o’r canlynol:Etholaeth Seneddol y Deyrnas Unedig Sir Fynwy,ac:Etholaeth Seneddol y Deyrnas Unedig Torfaen.