It covers the five prefectures of the Chūgoku region; Tottori, Shimane, Okayama, Hiroshima and Yamaguchi.
The league formed in 1973 with six teams from the Chūgoku region: Mazda Auto Hiroshima SC, Hiroshima Teachers, Mitsui Shipbuilding Soccer Club, Mitsubishi Oil, Mitsui Oil and Hitachi Works Kasado SC.
Teams would play in these smaller groups against each other once, meaning the final league result is based on 21 matches.
Furthermore, this means that teams finishing 9th or 10th will not be able to have the chance at promotion after the initial 18 matches, should they situation arise.
Up until and including the 1976 season, the All Japan Senior Football Championship was used in which the winner and runner-up played off in a promotion and relegation series against the bottom two clubs of the JSL.
The top two teams from each of the five prefectural leagues in the Chūgoku region meet in a promotional tournament.
The two teams positioned 9th and 10th at the end of the season are relegated to their local Prefectural League.