Also known as: インペルダウン
A supposedly inescapable prison in the world of One Piece.
Staff
- Hannyabal (One Piece) (Chief Warden)
- Magellan (One Piece) (Vice Warden)
- Saldeath (Chief Guard)
- Sadi (Chief Guard)
- Domino (One Piece) (Head Jailer)
- Shiryuu (One Piece) (Head Jailer; former)
Known prisoners
- Buggy The Clown (Level 1; escaped)
- Galdino (Level 2; escaped)
- Bon Clay (Level 5.5)
- Emporio Ivankov (Level 5.5; escaped)
- Inazuma (One Piece) (Level 5.5; escaped)
- Jinbe (One Piece) (Level 6; escaped)
- Crocodile (One Piece) (Level 6; escaped)
- Monkey D. Luffy (escaped)
- Daz Bones (Level 4; escaped)
- Donquixote Doflamingo (Level 6)
- Avalo Pizarro (Level 6; escaped)
- Sanjuan Wolf (Level 6; escaped)
- Catarina Devon (Level 6; escaped)
- Portgas D. Ace (Level 6; deceased)
- Shiki (Level 6; escaped)
- Arlong (released)
- Morley (One Piece) (escaped)
- Bellett (One Piece)
- Senor Pink