Hot Spring Island
From the Super Mario Wiki, the Mario encyclopedia
When first visiting the island, it is covered in lava, which can be removed if Mario captures a nearby Gushen to spray water. This allows him to collect the Power Moon for The Hot Spring Seal and unlock a Ground-Pound Switch needed to release a fountain. Upon defeating Mollusque-Lanceur, the island returns to normal, with two Bubblainians appearing on it; after completing the main story, more visitors from different kingdoms come to visit Hot Spring Island. Besides the Power Moon, a Checkpoint Flag and several regional coins can be found on the island.
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