This is highest football league in Wales, contains 12 clubs. The championship is split in two phases. In first one each team plays one match as host and one as guest against every other club for a total of 22 matches. When the first phase is over top 6 clubs are playing in championship group again 2 matches against each other club for a total of 32 matches per season. The first team is champion of Wales and qualifies for UEFA Champion League. 2nd and 3rd teams qualifies for UEFA Europa League. Clubs finished from 4th to 6th place are playing play-offs for the last spot in UEFA Europa League. Last 6 clubs after first phase are playing in relegation group 2 matches against each other. The winner of relegation group is the one who play in play-offs for spot in UEFA Europa League. Last two clubs from relegation group are demoted to lower divisions, and their spot are taken from winners of 2 groups in lower division.