Outskirts
From Arkham Horror Wiki
The Outskirts is a space on the board for monsters that should be in Arkham, but exceed the monster limit.
The Outskirts has its own limit, equal to (8 - the number of investigators). If a monster should enter the Outskirts when it is at the limit, all monsters in the Outskirts are returned to the monster cup, and the Terror level goes up by one.
