The Group, chaired by Shereen Wiliams MBE, Chief Executive of the Democracy and Boundary Commission, has gathered and reviewed a comprehensive range of evidence.
Mae'r Grŵp, o dan gadeiryddiaeth Shereen Wiliams MBE, Prif Weithredwr y Comisiwn Democratiaeth a Ffiniau Cymru, wedi casglu ac adolygu ystod eang o dystiolaeth.