The review will examine the boundaries of council wards across the county borough with a view to ensuring that each council ward has a roughly equal ratio of electors to councillors.
Bydd yr arolwg yn archwilio ffiniau wardiau cyngor ar draws y fwrdeistref sirol gyda'r bwriad o sicrhau bod gan bob ward gyngor gymhareb fras gyfartal o etholwyr i gynghorwyr.