Dechreuwyd y broses o adolygu ffiniau llywodraeth leol yng Nghymru gan Lywodraeth Cymru yn 2016. Mae gan Weinidogion ddyletswydd o dan Ddeddf Democratiaeth Leol (Cymru) 2013 i sicrhau llywodraeth leol 'effeithiol a chyfleus' ledled Cymru. Roedd Comisiwn Ffiniau a Democratiaeth Leol Cymru yn gyfrifol am edrych ar y ffiniau ym mhob un o'r 22 awdurdod lleol yng Nghymru, ac mae wedi ymgynghori ar gyfres o gynigion ar gyfer pob ardal awdurdod lleol.
The process of reviewing local government boundaries in Wales was started by the Welsh Government in 2016. Ministers have a duty under the Local Democracy (Wales) Act 2013 to ensure ‘effective and convenient’ local government across Wales. The Local Democracy and Boundary Commission for Wales was charged with looking at the boundaries in each of the 22 local authorities in Wales, and has consulted on a set of proposals for each local authority area.