But the Commission also considers that having more than one tier could complicate the designation of these areas, as well too as complicate the task of varying policy.
Ond mae’r Comisiwn hefyd o’r farn y gallai cael mwy nag un haen gymhlethu’r gwaith o ddynodi’r ardaloedd hyn, a byddai’n cymhlethu hefyd y gwaith o lunio amrywiadau polisi.