Island in the Sky (Cascade Kingdom)
From the Super Mario Wiki
Island in the Sky is a location in the Cascade Kingdom in Super Mario Odyssey. The island is found above the main part of the Cascade Kingdom. It can be accessed using a painting found in either the Snow Kingdom or the Seaside Kingdom, depending on which kingdom the player chooses to go to first. Located on the island is the Secret Path to Fossil Falls! Power Moon and a Checkpoint Flag.
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