Superdimension

Supedimension is the place where Nep-nep lives. It is the setting of Hyperdimension Neptunia and its remake, Hyperdimension Neptunia Re;Birth1.

Topology

Superdimension consists of four nations: Planeptune, Lastation, Lowee, and Leanbox. Each one is located on their own densely populated floating landmass. These landmasses each have their own unique climate and landscape. They float along aimlessly, perhaps orbiting a central point, and occasionally pass by each other. When one landmass approaches another, it is possible to travel from one to the other. Each landmass also has several islands that float close to it.

Celestia is located above the four landmasses. It is a complete mystery as to what is below the landmasses, or even where the landmasses are in specific. The blue skies imply that they float somewhere in the sky above a planet similar to Earth. Irregardless, the floating island shtick makes Superdimension far more interesting of a setting than Hyperdimension.

Trivia

• Each landmass has a giant Share Crystal located on a shrine somewhere. If the Share Crystal is removed, the landmass will stop floating and start falling.
• Superdimension doesn't actually exist in the series' canon; its true nature is a widely accepted fanon concept. The first game and the world it takes place in are entirely non-canon and are completely discarded by the series and developers. However, the concept of a "Superdimension" existing simplifies conversations about the series and allows the first game and its world to be discussed more easily without the addition of obnoxiously long qualifiers.