The Forbidden Zone is a location from the 1985 animated series She-Ra: Princess of Power.
She-Ra: Princess of Power
The Forbidden Zone is a part of Castaspella's magical kingdom of Mystacor. Here, years earlier, the Ancients put all of Mystacor's evil into this one place. It has held all the evil for centuries, but there is a spell in the Book of Spells that releases that evil.