(gonna post Imade comment here in case they decide to delete it)
Visuals Are Inconsistent
They are heavily inconsistent with one another while the statements are consistent and support a large Seireitei.
It's clearly obvious with Kubo's words that he intends for Seireitei to be huge; however, this can't be actually depicted with art so he repeatedly gives statements of a large size for Seireitei that I will bring up further down.
The largest piece of evidence for this is Kubo's own words on backgrounds and the existence of the Rukongai.
Rukongai
Never once in all the aerials of Seireitei (literally click the links Damage has given) do we see the Rukongai besides the Seireitei.
However, obviously that can't be true because we are told several times that the Rukongai lies directly outside the walls of Seireitei comprising of 320 districts with 80 in the North, 80 in the South, 80 in the East, and 80 in the West (I'll mention districts again later). None of the aerials show this, yet it is always said that it lies directly outside the walls and we are shown when they walk in the Rukongai that it is outside the walls. The aerials are inconsistent with each other and they do not even display what we know exist inside Seireitei (the mountains and other things I will explain further) and the things that exist directly outside the walls. I chalk it up to Kubo being lazy and not wanting to draw the aerials to scale and accurate as he has built his world to be, he consistently implies Seireitei is big and that the Rukongai is right outside which goes to my next point.
Small fact, Mayuri eliminated 28,000 souls from one of Rukongai's 64th District. There are 320 of these Districts.
Kubo Draws Very Little
Kubo doesn't even draw backgrounds, why would he keep drawing everything he states and consistently implies for the size of Seireitei to scale when the guy doesn't even draw backgrounds?
Kubo has literally said he avoids drawing too much like backgrounds because it takes focus away from what is important, the action and story.
Obviously his aerials are all inconsistent with each other because that's not his focus, thus he consistently states that it's big and has large things inside of it.
Too Inconsistent and Disregard Canon
First take the size of these scans and compare them to each other, not only are they not even consistent with each other, they literally ignore things that canonically exist in Seireitei and outside of it.
Yama's Division is a huge building that is not seen in any of the aerials.
Chojiro as buried on a hill that is above the normal buildings, yet no aerial shows it.
There are mountains directly located inside the Rukongai, yet only one aerial shows mountains right outside Seireitei.
That same aerial literally makes Seireitei look like 20 city blocks big. It's literally inconsistent with every other scan.
Literally the page after that has an aerial that contradicts it. These aerials are literally all inconsistent with each other.
Next page even makes it smaller than what we saw in the previous page. Should these aerials be taken as fact despite being inconsistent and ignoring canon statements and WoG?
This view of the Sokyoku literally contradicts every other view of it and makes it bigger than the majority of aerials.
This view is perhaps the best we have, but even it is inconsistent with this view. The Sokyoku and Senzaikyu are suppose to be the same size as Silbern (Silbern is the building with arches in the middle) and both are located in the center of Vandereich/Seireitei, yet when lined up, Seireitei and Vandereich's size are not even close to being the same when they are suppose to be the same size.
This view doesn't even show the Silbern, and many scans already show the Silbern tower over everything and put it at a size similar with the Sokyoku/Senzaikyu. So no, these aerials are not consistent with each other at all.
Those bushes that surround the Sokyoku are actually a giant forest with branches bigger than people, trunks bigger than people, and the forest itself is pretty damn big despite being the bushes around the Sokyoku. The aerials from outside sometimes show and sometimes don't show this forest, further proof of their inconsistency.
Also the meteor is pretty inconsistent, have you tried lining up the shots of the meteor with the visible Shakonmaku (the dome surrounding Seireitei)? They aren't even consistent with each other nor with other scans showing the Shakonmaku.
We have numerous scans that support Seireitei for being big and statements that Seireitei encompasses a huge area. We repeatedly get these facts and statements till the end of the series, yet the few aerials that exist also contradict each other and the canon facts that we know. So yeah, why stick with inconsistent visuals that we know Kubo does not care for than his own consistent statements and implications?
Mountains Are Inside SeireiteiyA4fson.jpg
This one is fairly obvious and actually has a statement for support.
First off, it is directly stated that the location for this area is The Seireitei and that it is the Training Grounds Behind Thirteenth Company's Barracks.
This is word confirmation that this area is located inside the Seireitei.
However, one of the two biggest reasonings that these mountains are inside the Seireitei and not outside is the fact that we cannot see the Seireiheki, the walls that surround Seireitei, they are not visible in this entire scene and a later scene 250 chapters later on in the series.
However, what I find to be the largest and undeniable piece of evidence for mountains existing in Seireitei are literally in a scan Damage linked himself that can be found in We Do knot Always Love You, where it's detailed that two characters travel mountainous terrain and even forests over several days while traveling inside the Seireitei itself. That is direct proof of not only mountains, but forests existing inside Seireitei.
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This is just one of the 13 Division Barracks located inside of Seireitei. One Division is confirmed to have mountains inside of them and forests are confirmed inside the Seireitei as well.
The Divisions
The Divisions are huge and we know there are 13 of them. One Division have mountainous terrain and confirmation of forests. One of the forest is located in the 7th Division as that is where the "scent of a fellow wolf" is located, Sajin Komamura who stays in the 7th Division area which is the forest he is found in.
More supporting evidence of the size of these Divisions can be found in the series. All the Divisions at least have the three following: the Barracks for the Division, the Company for the Division (offices and living areas), and the Training Grounds (13th is confirmed to have mountains in their training grounds).
1st Division
It is confirmed to hold a prison under it, the prison is huge as it holds several layers in it as well which includes Muken which expands for a huge area as we all know, with hills and forests as well.
Shinji Hirako remarks how huge the 1st Division Barracks are, in comparison to his 5th Division most likely.
116 1st Division Members were guarding the Northern Gate of Seireitei (the white walls have 4 gates for the cardinal directions), the 1st Division is located closer towards the center of Seireitei near the Senzaikyu and Sokyoku. The Division is big and has a lot of members.
2nd Division
2nd Division is pretty big and perhaps one of the biggest. It not only houses the 2nd Division Barracks, Company, Training Grounds, but also the Secret Remote Squad which is further made up of 5 Divisions on it's own.
One of those 5 Divisions of the Secret Remote Squad has it's own seclude prison that it manages which is surrounded by a pretty large moat as well (250 feet wide). Kisuke Urahara ran this part of the Division.
It's got like a castle on a hill for it's Division Company too for some reason.
3rd Division
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Not much is known besides Gin planting trees around this division.
It has a rather large open field (you can see the Japanese Kanji for 3 on the building) for it's Company which is apparently so large Toshiro's Shikai range fits inside just the 3rd Division area as there were no mentions from the other Divisions or Yamamoto of Toshiro's actions for using his Shikai and changing the weather in a 11.781 kilometer radius.
Still has it's training grounds, barracks, and company though.
4th Division
4th Division has a hospital inside of it as well as its usual Company, Barracks, and Training Grounds.
Not only that, it has a prison in it as well with at least 75 different cells in this prison.
5th Division
5th Company has a special prison (it held Izuru and Momo when they had drawn their weapons inside the Seireitei when it was illegal to do).
Besides that it has the usual Barracks, Company, and Training Grounds.
6th Division
You guessed it, it's own prison (held Renji and Rukia when Renji lost to Ichigo by order of Byakuya and Rukia after being detained from the Real World).
Also seems to have a more rich area unlike the other Divisions (most likely due to Byakuya being rich).
Then the usual 3 areas of a Division as well.
7th DivisionJjCXX2w.png
This is Komamura's Division which I already linked a statement above that showed it having a forest and mountainous terrain being crossed to enter it's forest.
Then the usual 3 areas of the Division as well.
8th Division
Not much is known besides the Soul Reapers Women's Meeting occurring here and that it has a huge courtyard.
Then the usual 3 areas of the Division as well.
9th Division
It holds the editorial and news publishing department for Seireitei.
Then the usual 3 areas.
10th Division
We've seen nothing of this Division, we just know it monitors Nariyuki City.
The usual 3 areas as well.
11th Division
We know nothing about 11th Division's area.
12th DivisionJPZFk5p.png
This one is big because of the Shinigami Research and Development Institute being located inside the Division as Kisuke founded it upon the Division.
The SRDI is big, they use elevators for the different levels and even institutes as the SRDI is further divided into different sections.
It even has factory stations on the surface.
On top of all of this is, Mayuri used his Bankai inside the Division which has a poison radius of near 200 meters (Viz mistranslated this line) and just like with Toshiro's Shikai range this poison did not affect the other Divisions nor was there mentions from Yamamoto or other Divisions of the poison affecting them.
This Division is big and still has the usual 3 areas of the Training Grounds, Barracks, and Company.
13th Division
There's still more here, besides the already confirmed mountains inside this Division, it also has a lake in it for Captain Ukitake.
Conclusion
The 13 Divisions are all pretty damn huge with large areas and cut into different sections. There are 13 of them and they all exist inside the Seireitei despite their large sizes and the fact that they don't make up the entirety of the Seireitei as it still has other sections and districts that I will be going over down the thread.
It's big as ****.
Other Notable Landmarks
There is more besides the Divisions, mountains, forests and etc. that I've covered so far.
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Hisagi states that he feels Yamamoto's Reiatsu coming from "The Third Old City"
This should be notable given that Hisagi is incredibly weakened right here and Yamamoto is going all out flexing his Reiatsu in Shikai, Hisagi being weakened due to his Reiryoku and Reiatsu being drained by Yumichika previously should have dampened Reiatsu sensing. Yet he could still sense Yamamoto's Reiatsu and was fine sensing it.
Nanao in the presence of an angry base Yamamoto was immediately incapacitated by his Reiatsu that Kyoraku had to shunpo her away from his Reiatsu and back in the same page, Yamamoto even praised his speed. Where the math comes in, during the fight between Aizen and the Captains, Yamamoto's Reiatsu was crushing and killing Hollows from over 13 miles away, possibly closer to 15-16 miles, as they were centered in Karakura Town.
"How do you know it was Yamamoto's Reiatsu?" Yamamoto is the most powerful person in Bleach at this point and even Aizen had admitted this.
So Hisagi would have to have been miles away from Yamamoto and the city he was in to have sensed Yama at all without suffering from the negative effects like Nanao.
So Seireitei has multiple cities located inside of it and they are huge as well.
Mansions / Living Areas
There are a lot of these for some reason.
Byakuya and Omaeda both have mansions due to wealth and nobility; however, they aren't the only ones as well (there are 4 Noble Families which Omaeda is not part of).
Byakuya's mansion is big.
Has a stream going through it.
Has a large open area located on it's grounds for graves.
Large enough for races down it's corridors and secret meetings to be held without Byakuya knowing given it's size.
Has secret compartments, giant fields, and personal guards for it's grounds.
It's just huge in general.
Oh yeah, and the scarf Byakuya is always wearing could buy 10 more mansions that are in the Seireitei. So there are more of these giant mansions besides Byakuya's Omaeda's, and the 3 other Royal Families.
These mansions all fit alongside the 13 Divisions, mountains, forests, cities, and other landmarks I will mention.
Stores / Departments
There's a lot of these.
Omaeda has jewelry and metal factories and stores with employees of course.
There are fashion departments / stores.
Restaurants and random food stores (Rangiku mentions meat/soba bun stores and liquor stores as well).
Canals
Canals and rivers exist under Seireitei.
Kido Corps Division
There is another entire Division solely for Kido Corps.
Forest
Besides the forest located in the 7th Division, we are told there are forest(s), plural, and we do know of the forest surrounding the Sokyoku that I mentioned earlier:
Those bushes that surround the Sokyoku are actually a giant forest with branches bigger than people, trunks bigger than people, and the forest itself is pretty damn big despite being the bushes around the Sokyoku.
Soul Reaper Academyb49242z.png
Obviously there is a Soul Reaper Academy.
Academies have to have dorms for their student body.
The student body is huge given it has 6th years in its school. My university is a 4 year university and it has a student body of over 30,000 for instance and 11,000 in Graduate school (Berkeley).
Conclusion
All of this exists inside of the Seireitei together alongside the already huge 13 Divisions.
It's big as ****.
Timeframes and Travel Time
Seireitei is huge and it's big enough that people can literally not see each other for over 40 years.
Todo was ordered by Kensei to go straight from their location in the Rukongai's West Fugai's 6th District to Kisuke in the 12th Division SRDI; however, Tendo was in a hurry and did not delay yet it took him from morning to midnight to go back and forth these two points from the Rukongai and Seireitei.
Another good example would be the entirety off the Soul Society arc. Ichigo's entire group was running around Seireitei trying to find Rukia for several days (over 5) and were making no ground despite their endurance (Ichigo and Uryu training non-stop for several days straight) and superhuman speed.
Yoruichi's 40 day statement can be included here.
The Wolf Cubs several day traveling statement over mountainous terrain and forests can be included here.
Seireitei is huge and Kubo has consistently portrayed it to be so massive it takes a long time to get around to travel through it.
Its big as ****.
The Vandenreich is a CountryietL0vq.png
Yhwach's empire is literally sectioned into territories.
His Empire is literally referred to as a country and considers Seireitei as another country ("not this country").
Yhwach's Empire is the same size as the Seireitei, it existed in it's shadows.
Yhwach's Empire = Country
Seireitei = Country
Vandenreich = Seireitei
Country = Vandenreich
Seireitei is a country in statement.
Its big as ****
Seireitei is Comprised of DistrictsuKNV8lr.png
There are numerous statements of Districts existing inside of Seireitei (Kubo has already given confirmation of 320 districts for the Rukongai and numerous statements of specific Districts in the Rukongai). The Seireitei has a lot more than the Rukongai with the numbers we have and these District statements go as far back as the Soul Society Arc (always with a number and cardinal direction as the Rukongai Districts are).
Seireitei's West section has at least 601 Districts which means Seireitei in total has at least 2404 Districts as it works with Cardinal directions and is a perfect circle.
For context, irl Japan only has 480 districts despite how large of a country it is (Seireitei is based off of Japan as well), ironically Lord_Xcano and I found the math behind Japan's irl district and Seireitei's district size with Yoruichi's statement line up almost perfectly. That size is not far off from the size taken from Fade to Black's size statement as well.
Remember, these 2404 Districts fit inside of Seireitei with it's mansions, cities, forests, lakes, mountains, Divisions, prisons, and etc. and etc.
Its big as ****.
Final Conclusion
Seireitei is huge as **** and it's getting tiring having to put up with Damage try every 4 months to regurgitate his same failed talking points to downgrade Bleach because of his personal bias.
There is literally too much context, implication, statements, and actual landmarks inside of Seireitei that Kubo is consistent with to disregard them all entirely for aerials that are literally not consistent with one another that disregard actual canon landmarks like the entire existence of the Rukongai and the mountains, mansions, forests, cities, districts, hills, buildings, prisons, towers, Divisions, factories, and etc. inside of the Seireitei.
A discussion rule needs to be made about this because it's getting annoying having to only put up with one user, a staff member, repeatedly try and fail to downgrade this every 4 months only to be disproven every time.