While the English Premier League is primarily composed of clubs based in England, participation is not strictly restricted to English teams alone. Under historical affiliations and geographical exceptions managed by The Football Association, select professional clubs based in Wales compete within the English football league system and have successfully earned promotion to play in the Premier League. The most prominent example is Swansea City, which spent multiple seasons competing at the top flight of English football, proving that cross-border participation within the domestic pyramid is entirely permissible under official league regulations.