 It consists of the urban area centred on Swansea city centre; the Swansea Valley including Clydach, Ystradgynlais and Pontardawe; and includes Neath and Port Talbot which lay outside the county boundaries, but excludes the urban area of Gorseinon within the county boundaries.The total population of the area in 2011 was 300,352  making it the 3rd largest in Wales, the 24th largest conurbation in England and Wales and the 27th largest in the United Kingdom.This was an increase of 11% from the 2001 figure of 270,506.