all four of Ireland's provinces competed in the Heineken Cup; Leinster's victory in the 2011 Heineken Cup Final gave Ireland a fourth Heineken Cup berth, which passed to Connacht as Leinster were already qualified via the Celtic League. All Ireland League The main domestic league in Ireland is the All Ireland League. This was started in 1990 and has now expanded to three divisions with a total of 52 senior clubs. The champion of Division 1A and of the All Ireland League is decided by a set of playoffs played at the conclusion of the 18 game regular season. The winner of this set of playoffs becomes All Ireland League champions for that season. The bottom club in Division One A IS relegated to Division One B to be replaced by the top club from Division One B with second bottom in Division One A playing off against second in Division One B. The bottom two from Division One B are replaced by the top two from Division Two A. The bottom two teams in Division Two A are relegated to Division Two B and third bottom in Division Two A plays off against third in Division Two B. The bottom club in Division Two B is relegated to the top division of junior rugby in their division while the team that finishes second bottom in Division Two B playoffs off against the team that finishes second in the round robin competition between the winners of the four provincial junior leagues See also Rugby union in Ireland References Sports league systems