 There are 104 clubs in the Kolmonen, divided in 9 groups of 10 to 12 teams each representing a geographical area.During the course of a season (starting in April and ending in October) each club plays the others twice, once at their home ground and once at that of their opponents.The top team in each Kolmonen group is promoted to Kakkonen and the two lowest placed teams are normally relegated to the Nelonen.