Azkaban is the jail of wizards in the fiction fantasy series by J.K. Rowling, Harry Potter. It holds most of the Death Eaters in prison. In Harry Potter and the Prisoner of Azkaban Rowling described Azkaban as "Cold, dark, and all your greatest memories you can't remember, and all you can think about are your worst." Dementors are the guards of Azkaban.
Azkaban is very big and very tall. The dementors that guard it have no mercy for whoever goes there. the best way to get sent to azkaban is using one of the three unforgivable curses.