The Isthmian League /ˈɪs(θ)miən/ is a regional men's football league covering London, East and South East England featuring mostly semi-professional clubs. It is currently known as the BetVictor Isthmian League for sponsorship reasons. It was founded in 1905 by amateur clubs in the London area. It now consists of 82 teams in four divisions; the Premier Division above its three feeder divisions, the North, South Ce…