Death Zone

The Death Zone was an area of Gallifrey used by the Doctor's ancestors. In the days before Rassilon, the Doctor's ancestors, among the first Time Lords, who had immense powers, used a device called the time scoop to pull beings out of time and place them in the Death Zone, where they would play "the Game" and try to destroy themselves. Sometimes "the Game" was referred to as "the Game of Rassilon", although he, according to history, is the one who put a stop to the Games.

Several Yeti, left over from the early games, continued to live within the Zone even when it was closed. The Daleks and Cybermen were never allowed to play "the Game" because they played too well. One of the many dangers of the Zone was the Raston Warrior Robot who resided within it.

The Death Zone was comprised of various different terrains which allowed different species to survive. There were mountains, marshes and one road. The fog was thick so one couldn't see where one was going and red thunderbolts continuosly fell from the sky. From a control room located within the Capitol, only accesible by playing the right tune on the Harp of Rassilon, a person could activate and use the time scoop to capture beings. When a being had been captured, a figure of them would be created and the figure would be placed somewhere on a model of the Zone, and wherever the figure was placed is where the being would materialize. From the Capitol, the High Council possessed a transmat system that was linked to the Death Zone and to the Tomb of Rassilon, which was located in the Zone.(DW: The Five Doctors)

The Death Zone is about the size of North Wales, despite those on Gallifrey believing it to cover a great distance. Both Iris Wildthyme and the Doctor know this. (EDA: The Scarlet Empress)