A derby bowl, also called just bowl or arena, is a place used for demolition derby. It usually contains a large number of seats for the crowd on the outer layers, and often has a duke in the middle. It is, in fact, shaped like a bowl.
In Destruction Derby games, bowls are used for demolition derby. It's used for the modes: Destruction Derby, Deathmatch, Destruction Race, Bomb Tag, Capture The Flag, Pass Da Bomb, Classic, Vampyre, Armageddon and Destruction Bowl - along with any career modes involving one of these events.