Kyōgoku (Seireitou)

Kyōgoku (叫谷, "Roaring Valley"; VIZ "Valley of Screams") is a dimension formed from. While existing as individual spacetimes, it appears that they are all connected in some way to, which serves as a bridge between the dimensions of reishi and. All forms of the afterlife, which differ depending upon the mythology and culture of a people, are believed to have matured from primordial reishi, influenced by the will of the culture which spawned its existence.

Soul Society
Perhaps one of the most developed Kyōgoku is the Soul Society, which houses the and the  which are brought there by the former via soul burial. It is one of the most highly-developed Kyōgoku as it has existed for several thousands of years, if not millions. Because of this, the inhabitants of the Soul Society had eventually forged a permanent pathway through the dimensional gap known to them as the Dangai, which led to connecting the dimensions of Soul Society and the aptly named Human World. It is suggested that the reason for its continuing existence for so long is due in part to the, who had managed to stabilize the realm many eons ago.

Behind the Scenes
This is the author's attempt at justifying the existence of multiple heavens and different spiritual dimensions in the Bleach universe.