Liga ABA, also known as Adriatic League, currently known as the NLB Liga ABA for sponsorship reasons, is a top-level regional basketball league that features teams from Bosnia and Herzegovina, Croatia, Czech Republic, Montenegro, Serbia and Slovenia. The league exists alongside scaled-down versions of domestic leagues in each country (Košarkaška liga Srbije, A1 Liga, Prvenstvo BiH, 1. SKL, Opportunity Liga). All of its teams join their country's own competitions in late spring after the Adriatic League regular season and post-season have been completed.