Cacao Island

Cacao Island is one of 34 islands surrounding Whole Cake Island as part of the Big Mom Pirates' main territory known as Totland.

Cacao is the fourth island visited by the Straw Hats in the New World.

Chocolat Town
Chocolat Town has houses made out of chocolate. It is legal to eat any of the chocolate structures with the exception of the roofs.

Past
At some point in the past, Cacao Island became part of the Big Mom Pirates territory also known as "Totland"

Whole Cake Island Arc
The Sanji retrieval team docked on Cacao Island for supplies on their way to Whole Cake Island. While there, Monkey D. Luffy and Tony Tony Chopper devoured Charlotte Purin's café and the Sanji retrieval team encountered Purin shortly afterwards.

Trivia

 * Cacao Island has buildings made out of edible materials similar to the house mentioned in Brothers Grimm's story Hansel and Gretel, coinciding with the Big Mom Pirates' fairy tale theme.
 * The edibility of this among all other islands is likewise similar to the "Chocolate Room" of candymaker Willy Wonka from the Roald Dahl novel Charlie and the Chocolate Factory.