Seireitei is in the center of the Soul Society.
OverviewSeireitei is a circular shiro with four main entrances, ten days walk apart, each guarded by one of the Gatekeepers. These gates are collectively called the Four Great Pure Soul Gates: these gates are made up of the Northern Black Ridge Gate, the Eastern Blue Stream Gate, the Southern Red Hollow Gate, and the Western White Way Gate. The gates are so heavy that it takes the full might of Jidanbō Ikkanzaka to lift one. There are however doors within the gates.
Information about the Seireitei is confidential. What is known is that the center of the Seireitei is a white tower known as the Senzaikyū, where criminals are imprisoned; on the hill adjacent to it is the Sōkyoku, where prisoners are executed. Those permitted to live in the tranquility of the Seireitei are Shinigami and the Noble Houses. Shinigami live in the Division barracks, while high-ranking officers commute from their own homes. The majority of the residents of the Seireitei, nobility and Shinigami alike, do not interact with the citizens of the Rukongai. However, residents of the Rukongai are allowed to apply for the Shin’ō Academy, which is often the only escape from the poorest conditions of the Rukongai.
The walls of the Seireitei are made of Sekkiseki, a rare type of stone known to negate all Reiryoku. The stone also forms a spherical barrier around the city, extending above and below, stopping anything spiritual from breaching it from ground level, from the sky or from underground. The wall that surrounds the Seireitei is commonly held up, only closing down when there is an emergency. When it is not down protecting the Seireitei, the wall protects the Soul Palace, located in an inner dimension.