Australia - South Australia State League 1

Links
ffsa.com.au Wikipedia

The South Australian NPL State League 1 is the second tier state-level football (soccer) competition in South Australia, ranked third tier in the national pyramid. The league are part of the National Premier Leagues (NPL) structure implemented by Football Federation Australia in 2012. It is conducted by the Football Federation South Australia (FFSA), the state's governing body. After the reforming of the South Australian football league structure in 2012, the league increased its participants from 10 clubs to 16. The FFSA has announced a restructuring of the league format in South Australia for the 2016 to 2018 seasons, moving from a 2 tiered system to a 3 tiered system with the introduction of a new 3rd division, which will reduce the participants in the State League down to 12.

A-League team Adelaide United entered their youth team in the 2015 season.