The Sixteen Realms

The Sixteen Realms are the worlds parallel to Ninjago which can be transferred via the Realm Crystal, an artifact that is located in the Tomb of the First Spinjitzu Master, as well as other energy sources.

Known Realms

 * Underworld
 * Dark Realm
 * Cursed Realm/The Preeminent (formerly; now destroyed)
 * Cloud Kingdom
 * Chima
 * 10 Other Unknown Realms

Trivia

 * The concept of the Sixteen Realms is similar to the Multiverse concept in various other fantasy and science fiction franchises. Notably, the fact that Chima is one of these worlds indicates that the Ninjago and Chima franchises share a Multiverse, though whether worlds based on other LEGO properties are also present is unknown.
 * The status of Ninjago in relation to the other realms is left somewhat ambiguous by dialogue. Fenwick spoke of the sixteen realms being parallel to Ninjago, while Wu spoke of "All sixteen realms" as though Ninjago were one of them.