Skypiea

Skypiea is an island in the sky ruled by a false god named Eneru. It is an island that a ship can get to using the Knock-Up Stream such as Luffy and his crew did. There is a sea of clouds that Devil Fruit people will sink into the same way they would with water back on the land.

Heaven's Gate, the entrance to Skypiea where they are told to pay 7 billion extols for the entrance fee. In this land they see anything from the place below as holy including soil. See more information about this in the Culture section.

They also have machines called wavers that are hard to use and take up to 10 years of training to learn to ride a waver.