Petal Isles

Petal Isles is a small archipelago in the center of the Flower Kingdom in Super Mario Bros. Wonder, comprising of many islands of different colors and climates. On the map of the kingdom, it is shown to be a location that Bowser hovers over during at least one point of the game. It is not treated as one of the six worlds in the game, though they surround and connect to it.

This world contains red-orange Wonder Flowers and Wonder Seeds, identical to the default color of Poplins.

Levels
Petal Isles contains an unknown amount of levels and Poplin Shops. Below are all the levels whose names are currently known.
 * Jewel-Block Cave