Swansea Mawr are able to speak Welsh, as can 38% of the ward of Pontarddulais. Clydach, Kingsbridge and Upper Loughor all have levels of more than 20%. By contrast, the urban St. Thomas has one of the lowest figures in Wales, at 6.4%, a figure only barely lower than Penderry and Townhill wards. Local produce includes: The city has three Grade One listed buildings: Swansea Castle, the Tabernacle Chapel, Morriston and the Swansea Guildhall. Swansea Castle was an impressive building occupying a strategic position above the River Tawe. The ruins that are visible today date from the late 13th and early
Swansea Reservoirs which supply Swansea include the Cray reservoir and the Lliw Reservoirs, which are operated by Welsh Water. The Local Gas Distribution company is Wales and West Utilities. There was a high rate of car crime during the 1990s. In 2002, the BBC described Swansea as a "black spot for car crime". Car crime is a central theme in the film "Twin Town", which was set in and around Swansea and Port Talbot. The football violence that Swansea experienced during the 1970s–1990s has considerably reduced, the only major clashes occurring between Swansea City supporters and Cardiff City supporters. Many matches