First division of the Japanese amateur football system and the only nationwide division for amateur clubs, from where are located some teams aiming to be promoted to the J.League in the near future through
associate membership system. Such teams are indicated with (A) in parentheses.
It are a group of nine parallel association football leagues in Japan that are organized on the regional basis. They form the fifth and sixth tier of the Japanese association football league system.
Teams with "Un" are feeder (or "B") teams for their universities' main football teams.
In the Regional Leagues, First divisions equals to Japanese fifth tier of league football, while 2nd divisions equals to the sixth tier. So, regional leagues who only have one single division, such as Shikoku, have teams going straight from the seventh to the fifth tier in case of a promotion.