Tournament of Power Arena, Dragon Ball Wiki

The Tournament of Power Arena (サ バ イ バ ル 会場, Sabaibaru Kaijō, lit. "Survival Venue") is the giant spinning top-shaped arena, located in the Null Realm, where the Tournament of Power takes place. It was built by the Grand Minister in Age 780. It is an arena that is made up of many quadrilateral, triangular, and circular bricks constructed in a 360 degree like fashion, resulting in the look of the arena resembling a giant spinning top. It also has a cylinder, made up by a stack of cylinder bricks

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