One Piece Fanon Wikia
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Impel Down, also known as the Underwater Prison (海底監獄 Kaitei Kangoku?) or the Great Prison (大監獄 Dai Kangoku?), is a government-controlled stronghold in Paradise together with Marine Headquarters and formerly, Enies Lobby. It is the World Government's maximum-security prison for the most dangerous criminals and pirates.[1] It is located underwater in the middle of the Calm Belt.[2]

Impel Down is the main setting of the Impel Down Arc.

  1. One Piece Manga and Anime — Vol. 38 Chapter 364 (p. 15) and Episode 255, Impel Down is first mentioned by Nami.
  2. One Piece Manga and Anime — Vol. 53 Chapter 522 (p. 10) and Episode 416, Elder Nyon explains where Impel Down is and how to get there.
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