From the Super Mario Wiki, the Mario encyclopedia
Salt-Pile Isle is a location in Super Mario Odyssey. It is located in the Luncheon Kingdom, in the middle of a sea of lava. It can be reached by capturing a Lava Bubble and using it to reach the island. The island contains a pile of salt with a Checkpoint Flag on it, and it has two Lava Bubbles circling around the island.
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