Carmarthenshire ( Welsh: Sir Gaerfyrddin ) is a principal area and a traditional county in south-west Wales. Administrative headquarters and the eponymous place is the town of Carmarthen. Other important towns are Ammanford, Burry Port, Kidwelly, Llanelli, Llandeilo, Newcastle Emlyn, Llandovery, St. Clears, Whitland and Pendine.
Carmarthenshire is one of the thirteen traditional counties. Until 1974 Carmarthenshire was also a Welsh administrative county and was then divided among the three Districts Carmarthen, Llanelli and Dinefwr of the newly formed county of Dyfed. In the administrative reform of 1996, the three districts were merged to form the Principal Area Carmarthenshire. Carmarthenshire has once again reflecting the status of a County.