The Planes of Existence

The Upper Planes

Hearth, the Main Realm
Plains of Elysium
Mount Olympus
Mechanus, Plane of Order
Midgard

The Lower Planes

Zeroth, the Void Plane Limbo
The Depths of the Abyss
Mortem, the Nine Hells
Requiem, the Dark Realm Shadowfell
Acheron, the Eternal Battlefield

The Elemental Planes

The ArborWeald
Vatna, Plane of Water
Alloy, Plane of Fire
Gaia, Plane of Earth
Zephyr, Plane of Air

The Outer Planes

The Null Realm
The Devouring Darkness
The Outer Light

The Planes Between

Resonantia, Plane of Echoes and Mirrors  
Astrala, the Astral Sea and Ethereal Planes 
Mount Celestia 

Type

Dimensional plane