Soul Society

Seireitei

Sereitei is the home of The Thirteen Court Guard Squads, The Stealth Force, The Kido Corps, Central 46, and the four great noble families. It is surrounded on all sides by a gigantic gate made of Seki Seki rock, which blocks out all traces of reiatsu from the sky, land, and even underground, making it next to impossible for intruders to make it in to the Sereitei.

Rukongai

Outside of the Seireitei is the Rukongai. The Rukongai is the largest portion of Soul Society and the most populated. It is divided into 320 districts, each numbered in descending order on how far they are from the center this results in the higher-numerated districts decaying into slums. Many of the Shinigami come from here even though the nobles usually create the captains.