English football league system
National League North and National League South (level 6, 22 teams each. 24 teams from the 2020–21 season, running in parallel): The champions in each division automatically win promotion. The next six teams in each division play in the playoffs. The playoff winner in each division gets the second promotion spot. The bottom two teams in each division are relegated to either the Northern Premier League, the Southern League or the Isthmian League as appropriate. If, after promotion and relegation, the number of teams in the North and South divisions is not equal, one or more teams are transferred between the two divisions. This makes it more even. It it based on the location.