A recognizable location in a game, anime, or other fictional universe.
It should be recognizable either through landmarks, architecture, terrain, and if it's the interior of a house or other structure, through floor, walls, furniture, or some other notable characteristic.
Other examples include: towns, levels, stages, dungeons, outdoor locations or hub areas in video games; the school, or the student council room in a slice-of-life anime; the tournament arena in an action manga; etc.
