Different dimensions

Dimentions
Runescpae as we know it is made up of multiple dimensions. These dimentions could have been made by seprate Gods. These dimensions can also, and mostly are, be known as Realms. Below are a list of realms:

RuneScape       Yu'biusk                        Shadow Realm           Fisher Realm                 Spider Realm

ScapeRune       Enchanted Valley           Spirit Realm               Abyss                           Runic Realms

Zanaris             Cosmic Plane                Grim Underworld         Void                              The Black Hole

Freneskea        Ghorak Plane                 Killerwatt Plane          Infernal Dimentions

Several other dimentions could possibly exist such as:

Earth (might be God Realm)

Elven Realm

God Realm (might be Earth)

Binding Dimensions
The one true binding dimension is the Abyss. The Abyss is the area that is traveled through when teleporting as proved in the lost and found random event. This means that The Abyss may connect all dimentions together. In the center of the Abyss is the Abyssal Rift near which a Zamorak mage is deep in concentration. It may be that the mage is keeping the dimensions seperate. The Abyss can be accessed during the lost and found random event, using Fairy Ring code ALR (after completing A Fairy Tale part II quest) or after completing the Mage of Zamorak Miniquest.

Another binding dimension may be the Void. The Void is the separation of all the dimensions. The Void is nothing but empty white colored space. The Void can be seen on the edges of the screen when in the Spirit Realm and is briefly visited during the Summers End quest.

A possible binding dimension is The Black Hole. The Black Hole was where players in Runescape Classic were sent when banned from the game. It was removed when players were trapping other players in it.