This pairing would unite 2 of the 4 UK Parliamentary constituencies that cover the City of Cardiff into 1 constituency, building on the established links that exist in the area.
Bydd yr etholaethau hyn yn cael eu ffurfio drwy gyfuno 2 etholaeth seneddol gyffiniol y DU (rhaid i 2 etholaeth fod yn cyffwrdd h.y.