Margarine Island is one of 34 islands surrounding Whole Cake Island as part of Big Mom's territory, Totto Land. It is run by Charlotte Galette, the Minister of Butter (バター大臣 Batā Daijin?).
Butter Town (バタータウン Batā Taun?) is a city situated on the island.
Less than 62 years ago, Margarine Island became part of the Big Mom Pirates' territory Totto Land, and Charlotte Galette was appointed the minister in charge of this island.