The
Isthmian League is a regional men's
football league covering
London,
East and
South East England featuring mostly semi-professional clubs. It is sponsored by
Ryman, and therefore officially known as the
Ryman League. It was founded in 1905 by amateur clubs in the London area. It now consists of 72 teams in three divisions; the Premier Division above its two feeder divisions, Division One North and Division One South. Together with the
Southern League and the
Northern Premier League, it forms the seventh and eighth levels of the
English football league system. It has various regional feeder leagues and the league as a whole is a feeder league mainly to the
National League South.