A total of 22 clubs from five countries have played in the top-tier of the Regional League. Finals note In 2008–09 season, the league was played in a round-robin tournament format. Awards Records and statistics Performance by clubs By country References External links Adriatic Water polo competitions in Croatia Water polo competitions in Serbia Water polo competitions in Montenegro Water polo competitions in Slovenia 2008 establishments in Europe Sports leagues established in 2008 Multi-national professional sports leagues