From BZPB Wiki

Chronospace is a strange dimension located outside of time. During the Battle of Destral, Blackout used the Snare to send Ynot there.

It is also used by the Observers to observe the past, present and future of the Original Universe.

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Dimensions Celestial Planes | Chronospace | Guf | Hueco Mundo | Hyperspace | Infernal Planes | Internet Dimension | Knowledge Dimension | Shadows and Fire Dimension | Sixth dimension
Pocket Dimensions Forest of Lights | Realm of Shadows | The UG