Designation provides the basis for policies designed to enhance as well as preserve all those aspects of the character or appearance of an area that contribute to its special interest.
Mae dynodi yn darparu sail ar gyfer polisïau sydd wedi’u cynllunio i wella yn ogystal â diogelu’r holl elfennau hynny o gymeriad neu olwg ardal sy’n cyfrannu at y ffaith ei bod o ddiddordeb arbennig.