Some definitions of West Wales include only Pembrokeshire, Ceredigion and Carmarthenshire, which historically comprised the Welsh principality of Deheubarth and was called "South West Wales" in the Nomenclature of Territorial Units for Statistics (NUTS). Other definitions include Swansea and Neath Port Talbot but exclude Ceredigion. The "West Wales and the Valleys" NUTS area includes more westerly parts of North Wales. The preserved county of Dyfed covers what is generally considered to be West Wales; between 1974 and 1996, Dyfed was also a county, with a county council and six district councils.
Historically, the term West Wales was applied to the Kingdom of Cornwall during the Anglo-Saxon invasion of Britain and the period of the Heptarchy. The Old English word Wealas, meaning "foreigners" in the sense of Britons, gave its name to Wales and was also applied to Cornwall, as "West Wealas" to mean western foreigners.
- Geography of Wales
- South West Wales
- South Wales
- Mid Wales
- North Wales
- Principality of Deheubarth
- Kingdom of Dyfed
- West Wales Properties
- Davies, John, A History of Wales, Penguin, 1994, foundations of p. 87, 95
- ONS NUTS guide to Wales statistical groupings
- West Wales Chamber of Commerce
- Future Skills Wales Project Summary Report for West Wales 1998-2007
- The Historical Atlas by William R. Shepherd, 1926