The Austrian Regionalliga (which means Regional League) is the third-highest division in Austrian football, after the Austrian Bundesliga and the Second League. It is divided into three groups: East (Ost), covering the states of Vienna, Lower Austria and Burgenland; Central (Mitte), covering the states of Styria, Carinthia, Upper Austria and the exclave of East Tyrol; and Eliteliga West, covering the states of Salzburg, Tyrol (with the exception of East Tyrol) and Vorarlberg.
--from Wikipedia
Here's a data visualization demo of Regionalliga division leaders from 2019/2020 season.