Swansea, officially known as the City and County of Swansea, is a coastal city and county in Wales. It is the second largest city in Wales after Cardiff, and the twenty-fifth largest city in the UK. Swansea lies within the historic county boundaries of Glamorgan and the ancient Welsh commote of Gŵyr. Situated on the sandy South West Wales coast, the county area includes the Gower Peninsula and the Lliw uplands.