Carmarthenshire (/kərˈmɑːrðənʃər, -ʃɪər/;[1] Welsh: Sir Gaerfyrddin; [siːr gɑːɨrˈvərðɪn] or informally Sir Gâr) is a unitary authority in southwest Wales, and one of the historic counties of Wales. The largest town in Carmarthenshire is Llanelli, a market town with a population of 25,000. The area has many farms, and the land is very rural and has many hills.