Carmarthenshire is a unitary authority in southwest Wales, and one of the historic counties of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre.

Carmarthenshire is mainly an agricultural county, apart from the southeastern part which at one time was heavily industrialised with coal mining, steel-making and tin-plating. In the north of the county the woollen industry was very important in the 18th century. The economy depends on agriculture, forestry, fishing and tourism.

The decline in its industrial base, and the low profitability of the livestock sector, saw West Wales identified in 2014 as the worst-performing region in the United Kingdom along with the South Wales Valleys.

However, Carmarthenshire offers a wide range of outdoor activities for the tourist.

Much of the coast is fairly flat; it includes the Millennium Coastal Park, which extends for ten miles to the west of Llanelli; the National Wetlands Centre; a championship golf course; and the harbours of Burry Port and Pembrey.

Further west are the sandy beaches at Llansteffan and Pendine, and Dylan Thomas' boathouse at Laugharne. There are a number of medieval castles, hillforts and standing stones in the county.

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