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Rukongai

Rukongai is divided into 320 districts (80 in North Rukongai, 80 in West Rukongai, etc.), each numbered in descending order on how far they are from the center; this results in the higher-numbered (and farther) districts decaying into slums. Thus, while District 1W is peaceful and lawful, much like the antiseptic lifestyle of early-Edo Era Kyoto, District 80W is a hardscrabble, violent, crime-infested area that more depicts Heian era Kyoto. The duties of the Gotei 13 Divisions include defending allocated districts of Rukongai.

The First district of each location also possesses a Gate into Seireitei, guarded by a large creature with power equivalent to a seated member of the gotei 13.

Special Rules: in our roleplay we will refer to areas by 1-80 and the direction from Seireitei they are in for ease of defining an area.
If you are interested in the actual number take the number and mulitply it by the following

N-1 | E-2 | S-3 | W-4
80N = 80 | 80E = 160 | 80S = 240 | 80W = 320