A wizard's prison located on an island in the middle of the North Sea. Using certain Charms, the prison is hidden from the muggle world, and is unplottable. It gained a reputation as a horrible place, given that its former guards, Dementors, cause great suffering to those in their proximity; most prisoners eventually went insane and slowly died under their influence. Since 1717, using any of the three Unforgivable Curses on another human being has carried a punishment of a life sentence in Azkaban (unless there is sufficient evidence that the caster did so under the influence of the Imperius Curse).
