Llansteffan, is a village and community situated on the south coast of Carmarthenshire, Wales, lying on the estuary of the River Tywi, 7 miles (11 km) south of Carmarthen.

Carmarthenshire is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as the "Garden of Wales" and is also home to the National Botanic Garden of Wales.