The Bristol Downs Association Football League is a completely standalone league. It has four divisions which have relegation and promotion within themselves but if you win Division One you are the Downs League champions, there is no promotion into any other league. This is what makes it so unique.
It is also thought to be the largest independent standalone league in Europe.
The Downs League was formed in 1905 with 30 founder members, two of the founder member clubs, St Andrews and Sneyd Park, remain in the league to this day.