Carmarthenshire, Welsh Sir Gaerfyrddin, county, 926 sq mi (2,398 sq km), S Wales. In 1974, Carmarthenshire became part of the nonmetropolitan county of Dyfed, but in 1996 Dyfed was dissolved and Carmarthenshire was restored as a unitary authority. The National Botanical Garden of Wales is located in Llanarthne.

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