Charles III Heir Apparent William, Prince of Wales First Minister (list) Rt Hon Eluned Morgan MS (L) Deputy First Minister Huw Irranca-Davies MS (L) Counsel General-designate – Elisabeth Jones Chief Whip and Trefnydd – Jane Hutt MS (L) Permanent Secretary Sixth Senedd Llywydd (Presiding Officer) Elin Jones MS (PC) Leader of the Opposition Darren Millar MS (C) Shadow Cabinet Prime Minister Rt Hon Keir Starmer MP (L) Secretary of State for Wales Rt Hon Jo Stevens MP (L) Principal councils (leader list) Corporate Joint Committees Local twinning see also: Regional terms and Regional economy United Kingdom Parliament elections European Parliament elections (1979–2020) Local elections Police and crime commissioner elections Referendums The Senedd constituencies and electoral regions (Welsh: Etholaethau a Rhanbarthau etholiadol Senedd Cymru)[i] are the electoral districts used to elect members of the Senedd (MS; Welsh: Aelodau'r Senedd or AS) to the Senedd (Welsh Parliament; Welsh: Senedd Cymru), and have been used in some form since the first election of the then National Assembly for Wales in 1999.

New boundaries were introduced for the 2007 elections and currently consist of forty constituencies and five regions.

Each constituency elects one Member by the first past the post (single-member district plurality, SMDP) system, and the additional Senedd seats are filled from regional closed party lists, under the D'Hondt method, with constituency results being taken into account, to produce a degree of proportional representation for each region.

Altogether, the sixty Members of the Senedd are elected from the forty constituencies and five electoral regions, creating a Senedd of forty constituency MSs and twenty additional MSs.

When enacted the act reinforced the link between Assembly and UK Parliamentary constituencies, and that the number of electoral regions is five.

The changes in the boundaries for constituencies and electoral regions of the Senedd came into force for the 2007 National Assembly for Wales election.

In a session of the House of Commons where the then secretary of state for Wales, Cheryl Gillian was questioned on the Labour party's opposition to the decoupling of the two constituencies, she replied:[9] That is a very interesting thought.

The borders of each constituency are drawn using Local government boundaries, defined in Parliamentary Voting System and Constituencies Act 2011 as "the boundaries of counties, county boroughs, electoral divisions, communities and community wards".

[5][11] The Boundary Commission for Wales, a non-departmental public body, is responsible for proposing alterations to the boundaries of UK parliamentary constituencies in Wales, and reports proposals to the UK Government.

Organisations such as the Electoral Reform Society Cymru have indicated a preference for coterminosity (meaning the mirroring of Senedd seat boundaries in Wales along the lines of the 2016 proposed reforms to the Welsh seats in the UK Parliament),[13] however, such coterminosity is merely desired and is not enforced by law, meaning any changes to UK parliamentary constituencies in Wales do not necessarily need to be mirrored with the same changes for Senedd constituencies.

[14] (Welsh name) Aberafan Alun a Glannau Dyfrdwy Brycheiniog a Sir Faesyfed Pen-y-bont ar Ogwr Caerffili Canol Caerdydd Gogledd Caerdydd De Caerdydd a Phenarth Gorllewin Caerdydd Dwyrain Caerfyrddin a Dinefwr Gorllewin Caerfyrddin a De Sir Benfro De Clwyd Gorllewin Clwyd Cwm Cynon Gŵyr Merthyr Tudful a Rhymni Sir Fynwy Sir Drefaldwyn Castell-nedd Dwyrain Casnewydd Gorllewin Casnewydd Ogwr Preseli Sir Benfro Dwyrain Abertawe Gorllewin Abertawe Dyffryn Clwyd Bro Morgannwg Wrecsam Between the first election in 1999 for the then National Assembly for Wales, to the 2007 election, there were three former constituencies.

They further suggested cutting the compass directions from the excepted names if needed, for them to be used as Welsh-only.

While Andrew RT Davies former leader of the Welsh Conservatives, called the decision a "disenfranchise[ment]" of English-language only speakers, and called for constituencies covering English-speaking majority areas to have English-language names as well.