Skypiea

Skypiea is a high-level island in the sky. There is a beam shooting out the bottom of the island which can teleport you to the top of the island, with a rock sitting at ground level beneath the island. The island looks like it's sitting on the clouds, and you can also walk on some of the clouds with bridges leading onto them. God Fruit can spawn here.

Skypian is level 1,350.

Enel is level 6,000.

Items
Yoru is found here, you can buy it for 2,500,000 million Beli on one of the smaller floating islands above the main one. You need level 3,000 for it. The maximum stat amount for Yoru is 250,000