These grounds are used to spar or train by bot young and old Shinigami. It's a large envirement which is mainly grass and trees.

At the center of Seireitei are the Shrine of Penitence, a white tower and Sôkyoku Hill, where executions take place. The schrine has however has been destroyed and is no longer used for executions.

Insignia: Chrysanthemums
Meaning: Truth and Innocence

Captain: Vacant
Lieutenant: Vacant

Duties: This division is the head of Gotei 13 and the ones responsible for relaying Central 46 orders, dealing with Soul Society law and monitoring the other divisions. The captain of the 1st Division is also the head of all other captains and the leader of Gotei 13, given the rank of General Commander. Likewise, the 1st Division vice-captain is leader of the vice-captains and has authority over all vice-captains, next to their own captains and the General Commander.

The Captain is in charge of the Executive Militia, the Lieutenant is in charge of the Patrol Unit, and the 3rd Seat is in charge of the Detention Unit.

Commander in Chief: Captain Squad 2
Executive Militia Leader: 3rd Seat Squad 2
Patrol Corps Leader: 4th Seat Squad 2
Detention Unit Leader: 5th Seat Squad 2

Also called the Secret Mobile Unit/Corps, Special Forces or Covert Ops, is one of the three branches of the military under the control of the Central 46 Chambers, the others being the Gotei 13 and the Kidô Corps.

Special Forces Division:

Executive Militia: The first branch of the Onmitsukidô. It is ranked the highest of the five branches in the division. Their responsibilities including punishment and assassination of ex-comrades who break the law and acting as scouts during battle against Hollows.[3] Its members are dressed all in black and are known for their cold-bloodedness. They specialize in combat using Hakuda. It is normally headed by the the Commander-in-chief of the Onmitsukidô.

Patrol Corps: Their apparent job is to patrol the Seireitei. In the event of those under house arrest escaping they also are tasked with finding and apprehending them. Externally they patrol the various lands and dimensions to combat dangerous Hollows and other enemies of Soul Society.

Detention Unit: The Detention Unit is responsible for the imprisonment and supervision of all criminals within the Seireitei. They also have another duty known as Special Detention, which concerns those who joined the Gotei 13 but were judged to be a danger to their fellow Shinigami. They investigate, apprehend, and keep these individuals sealed away from the rest of Soul Society within the Special Underground Detention Facility, aka. the Nest of Maggots. It should be noted that those few who are kept in the Maggots' Nest have not actually committed any crime but have been identified by the laws of Soul Society as "Dangerous Elements". This unit acts somewhat similar to a prison and mental rehabilitation center.

The Nest of Maggots is a prison under the supervision of the third corps (known as the Detention Unit) of the Onmitsukidô. It is located on the grounds of the Second Division, and is surrounded by a moat. On the inside, it resembles a cave with an area for prisoners.

Insignia: Marigold
Meaning: Despair

Captain: Vacant
Lieutenant: Vacant

Duties: The 3rd Division is the unit that are responsible of the act of sending out shinigami to gather information, and sometimes work in cooperation with 2nd Division agents on more serious missions. They are also the ones that sort all outgoing and incoming information before sending them to the 12th Division for storage. Adding to this, they are in charge of the jigokuchou monitoring and message system.

Insignia: Bellflower

Meaning: Those Who Grieve Are Loved

Captain: Vacant
Lieutenant: Vacant

Duties: The 4th Division deals with the brunt of the healing when it comes to shinigami or other spiritual entities. While the shinigami in this division use medicines for their healing, they do have the ability to use their energies for curative purposes, something unique to those that are in or have been in the 4th Division, because the average shinigami can only use their power for combat.

Insignia: Lily of The Valley
Meaning: Danger, Sacrifice, Pure Love, Humility, Sweetness

Captain: Vacant
Lieutenant: Vacant

Duties: The captain of the 5th Division is also captain of the Kidou Corps; one of Soul Society’s two other military fractions except for the Gotei 13. Members of the 5th are in general kidou experts, and are often stationed together with 11th Division members, 2nd Division assassins as well as 4th Division healers to form an all-around military group. They are also responsible for all sealing and magical workings inside Soul Society, as well as recording and storing any new kidou.

Kido Corps Commander:
Vice Kido Chief:

This a separate branch of Soul Society's military that excels in the art of Kidô. It takes students from the Shinigami Academy that excel in Kidô and trains them to further their abilities in said area. Its operations are executed in absolute secrecy, little else is known. During an incident one hundred years ago Jûshirô Ukitake noted how rare it was to see anyone from the Kidô Corps, especially the captain.

Insignia: Camellia
Meaning: Noble Reason

Captain: Vacant
Lieutenant: Vacant

Duties: The 6th Division handles all of Gotei 13’s internal affairs, such as monitoring shinigami activity and handling any disturbances from other shinigami. They are responsible for apprehending shinigami that breaks Soul Society laws and also detaining them until Central 46 has given their verdict in the matter. Their division has the most holding cells, which is used to detain criminal offenders until they are judged.

Insignia: Iris
Meaning: Courage

Captain: Vacant
Lieutenant: Vacant

Duties: The 7th Division maintains peace between Seireitei and Rukongai. They make sure shinigami don't go causing chaos in Seireitei, and are completely responsible for keeping Rukongai civil... or at least the area closest to Seireitei. When souls have complaints/suggestions/questions/etc, whatever, they send is sent to the 7th Division where it is read, ignored, taken into consideration, and decided upon. They often act on their own, but also work with various other divisions.

Insignia: Bird Of Paradise
Meaning: Everything is Obtained

Captain: Vacant
Lieutenant: Vacant

Duties: The 8th Division is the mass reinforcement division. Their shinigami are split into groups that are talented in kidou, offensive tactics, or defensive tactics. When any of the other divisions require extra shinigami or reinforcements, the 8th is the division they turn to first.

Insignia: Buttercup
Meaning: Oblivion

Captain: Vacant
Lieutenant: Vacant

Duties: The 9th Division prevents information from leaking, as well as information being stolen. Their shinigami work close with the 12th Division research facility, to protect it from outside influence. They also prevent important information from leaking into Rukongai, especially information that could cause an uproar or mass panic. Adding to this, they are also in charge of dealing with tactics and warfare against intelligent beings and massive hollow gatherings, and are the ones responsible for any counter tactics when Seireitei is under attack. 9th Division is also in charge of the memory-replacing that has to be done after shinigami fight in the living world.

Insignia: Daffodil
Meaning: Mystery, Egoism

Captain: Vacant
Lieutenant: Vacant

Duties: The 10th Division is in charge of planning, coordinating, and executing large missions. Everything is run through their division first, and if approved, the 10th Division gathers the required shinigami from each division, assembles them, assigns duties, plans the attack, coordinate the shinigami according to the mission, execute the attack, and then keep maintenance over it. That includes sending out more reinforcements and information regarding the mission.

Insignia: Yarrow
Meaning: Fight

Captain: Vacant
Lieutenant: Vacant

Duties: The 11th Division is the frontlines. They are the most skilled in physical combat and work mainly with other divisions. They rarely work on their own since they currently lack much coordination. During times of danger, the 11th Division is flooded out in mass numbers to immediately subdue problems, which include invasions of Seireitei. The 11th Division works with nearly every other division, since they are the most powerful and offer the most defense and offense.

Insignia: Thistle
Meaning: Vengeance, Strictness, Independence

Captain: Vacant
Lieutenant: Vacant

Duties: The 12th Division is in charge of gaining new information through experimentation. They research information that is sent to them from the third division before storing it. They are also in charge of storing a mass amount of information known to Seireitei in their database. The 12th Division also develops new technology to aid shinigami in their missions.

President: Vacant
Vice-President: Vacant
Head of Research Offices: Vacant

The institute is behind the development of many of the technologies that aid the Shinigami. The Shinigami Research and Development Institute has performed extensive research into the modification of souls; the results of this research were artificial souls, both in the form of "soul candy" and Project Spearhead. The SRDI also tracks spirit activity in the real world, maintains Gigais, and developed Kenpachi Zaraki's reiatsu-absorbing eye patch.

The Shinigami Research and Development Institute has a series of labs specializing in particular types of research. These specialized labs include,

Spiritual Wave Measurement Lab: In-charge of monitoring Arrancar activities. Rin Tsubokura is a member of this lab.

Communication Technology Research Department: This lab is responsible for the development of communication technology, including soul cellphones.