Jail Island is a location in The AnimeLand's Swamp-Sewers. This is a location where criminals and disrepective students go when being punished. It is guarded by Might Guy. As the series progressed, Duncan's family is the leader of the island. Students receive a lifetime detention in Jail Island.
- Noah: Many reasons
- Raggedy: Threatening assult of a sprite
- Meriwheter Lewis: Not requiring an exponential license
- William Clark: Not requiring an exponential license
- Sacagawea: Illegal gambling
- Charbonneau: Illegal gambling
- Weasel: Adoption
- Sam the Cowboy: Crime of the old West
- Conan: Harassment through alien life forms
- Boris: Tootsie pop littering
- Trix Rabbit: Framed
- Captain Crunch: Framed
- Travis: Illegal doom buggy jacking
- Alvin & the Chipmunks: Framed.
- Reiko: Kidnapping a superstar and illegal crimes.
- Megumi Hanajima: Giving explosive pies to Mackey Ghostface and Biomage, almost causing threats to official police officers and the world (Chickenbark actually did this but Megumi took the blame for him)