Jam Island is one of 34 islands surrounding Whole Cake Island as part of the Big Mom Pirates' main territory known as Totto Land. It is run by a minister like other islands on Totto Land. It is the second island of the Charlotte Family siblings' secret route to Whole Cake Island.
Jam Island has rivers of juice flowing though it pouring to the sea, coloring the waters around it. 
At some point in the past, Jam Island became part of the Big Mom Pirates territory also known as "Totto Land".
Totto Land ArcEdit
The Sanji retrieval team passed by Jam Island on their way to Whole Cake Island. 
- Jam Island has buildings model after glass mason jars, commonly used to store food such as jam.
- ↑ 1.0 1.1
One Piece Manga — Chapter 829 (p. 3-4),
The Sanji retrieval team spot Jam Island before continuing their journey.
- ↑ 2.0 2.1
One Piece Manga — Vol.
82 Chapter 827 (p. 5),
Pekoms explain the Sanji retrieval team about Totto Land.
One Piece Manga — Chapter 829 (p. 6),
Pedro explain the reason for the grape-colored sea.