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With five sectors (Solar, Obscurus, Pacificus, Tempestus, and Ultima), I was curious what Marine chapters, Imerial forces, and Xenos are commonly attached to each.

For instance, Tyrannid and Tau are most likely found in Ultima sector, despite having popped up elsewhere, while Chaos (and Cadians) are naturally found in Obscurus, despite slipping into other regions now and then.

I can find several of the First Founding marine homeworlds, and use those to place some chapters (Though the Space Wolves insist on being on a borderline between two... darn their non-conformist ways!), but after that, it gets tricky.

I'll start with the easy one. Orks are bloody everywhere. I guess necrons and eldar could be basically anywhere, depending on whatever ancient crises they're dealing with today.
With regards to the space marines, note that several chapters have unique duties (the bunch whose name I forget around to eye of terror, the Guardians of the Covenant, and formerly the Astral Claws are all examples). Second foundings were probably placed willy-nilly after the HH, so be cautious with them. There are multiple excuses to see a group of marines away from their usual domain though.
With guard, I thinks its a little different. They are being moved by the paperwork, not their own will, so they could end up being sent anywhere in a few months/a year. Also, except for planets like Cadia and Armageddon, which are constant battlefields, I was under the impression that most regiments were sent away from their local sector and any attachments they might have.

@Mudrat

You do know that at the very least the Eldar craftworlds are, to my knowledge, associated to different regions of space? In fact, there was an Eldar v. Tyranid campaign book published in 2014, I think it featured Iyanden. So the implication that I get from it is that Iyanden is in the galactic east, possibly farther out than the Tau Empire. And one of them circles the Eye of Terror, I think it was Biel Tan. I'm sure this information is floating around somewhere...

So ofc Tau and Tyranids are all in the Galactic Far East, Ultramar is famously just west of them, The Alpha Legion and Red Corsairs are all in the Galactic East as well (Red Corsairs being based in the Maelstrom, which is pretty much straight north of Ultramar, Alpha Legion being eastward mostly but they've scattered themselves across the galaxy so that they can stay as mysterious as possible) while most of the rest of Chaos (Marines, Daemons, and all others) are of course in the Eye of Terror, which very firmly in the galactic west. I never memorized the sectors, so I'm not sure which is which.

I'm sure you could find information about where the Necron Dynasties are similarly to the Craftworlds. Orks are everywhere, though. I don't ever once remember hearing that the various ork clans are region-specific, as far as I know every ork clan is spread all across the galaxy.

I am interested in this question as well, though. I've wondered it a lot myself. Past what I just mentioned.

 Quarterdime wrote:
@Mudrat

You do know that at the very least the Eldar craftworlds are, to my knowledge, associated to different regions of space? In fact, there was an Eldar v. Tyranid campaign book published in 2014, I think it featured Iyanden. So the implication that I get from it is that Iyanden is in the galactic east, possibly farther out than the Tau Empire. And one of them circles the Eye of Terror, I think it was Biel Tan. I'm sure this information is floating around somewhere....

My bad. What I was getting at was that they can be encountered basically anywhere, following their various prophecies and schemes. All the craftworlds have their own location, but with the webway they can actually pop up just about anywhere they please. I guess the same goes for chaos warbands, provided the warp allows it.

@Quarterdime

Mudrat was pretty much right. There is generally at least 1 craftworld in every Segmentum although they do not really move around all that much depending on what happens. This does not count for Corsairs or Harlequins though, who go wherever they want on a whim.

Ulthwe circles the Eye of Terror
Biel-Tan is Southern Rim
Iyanden is eastern fringe
Alaitoc is Ultima Segmentum
Saim Hann is Segmentum Pacificus

Those are the major ones. There are tons of minor ones all over. To round out the list a little better

Altansar is Segmentum Solar
Il-Kaithe is Segmentum Obscurus
Iybraesil is Segmentum Pacificus

The best map I think I have seen is the one in the Deathwatch codex.
Since they ARE all about fighting the Xenos.
Some groups are mobile so it updates things like where "The Rock" is for the Dark Angles or a couple of the Black Templar Fleets.

Off topic request here, but could someone with better eyesight tell me what warp storm that is in the path of hive fleet gorgon and who's crusade seems to be exiting the galaxy via segmentum pacificus.

Hades I think...

Its blurry as hell.

The crusade I cannot see.

 jhe90 wrote:
Hades I think...

Its blurry as hell.

The crusade I cannot see.

I can't find a warp storm Hades on the interwebs, although that might be because GW doesn't think a Tyranid fleet entering the warp to fight with daemons would be interesting.

 mrhappyface wrote:
Off topic request here, but could someone with better eyesight tell me what warp storm that is in the path of hive fleet gorgon and who's crusade seems to be exiting the galaxy via segmentum pacificus.

That is the Hadex anomaly, of which you can find tons and TONS of information about across all of the Deathwatch RPG books and supplements. Although technically there is a contradiction, as that's supposed to be Hivefleet Dagon, an offshoot of Hivefleet Kraken, that's in the vicinity of the Hadex Anomaly, not Hivefleet Gorgon.

The crusade in Segmentum Pacificus is the Black Templars, unsurprisingly.

I am certain the two fleets Ghoulstars and Pacificus is Black Templar (my main army!).

The one near Maelstrom is the Fists.

Yeah, there's a million reasons why any individual army would be in any particular place in the galaxy. The only one that's hard to do that with is Tau, but they have a million reasons why everyone would be near them.

Obviously, some details would become harder to work out the more specific you get. Like, Nids and Tau fighting is not crazy. Tau from Sa'cea Sept fighting Hive Fleet Moloch would be strange.

 Lusall wrote:


Obviously, some details would become harder to work out the more specific you get. Like, Nids and Tau fighting is not crazy. Tau from Sa'cea Sept fighting Hive Fleet Moloch would be strange.

It gets difficult to figure out DE vs Nids, DE vs Daemons, Necrons vs Nids, and Daemons vs Nids. The whole motivation of each side is somehow lost. You can stretch it with a lot of narrative, but it is difficult.

 Exergy wrote:

 Lusall wrote:


Obviously, some details would become harder to work out the more specific you get. Like, Nids and Tau fighting is not crazy. Tau from Sa'cea Sept fighting Hive Fleet Moloch would be strange.

It gets difficult to figure out DE vs Nids, DE vs Daemons, Necrons vs Nids, and Daemons vs Nids. The whole motivation of each side is somehow lost. You can stretch it with a lot of narrative, but it is difficult.

DE versus Nids is simple,. they want some beasties to toy with and experiment on. Exotic ones. Necrons Vs Nids, whoa, Nids am gone, they avoid the metal bots like the plague. And my personal favorite, Daemons Vs. Nids. Two mighty Apex predators duking it out over who gets to consume the souls/biomass of the world they are currently on. This was actually addressed in the Tyranid Codex, on a world where Four Greater Deamons popped up after a big ritual, and a Hive Fleet swooped in. It was pretty great to read.

As for DE Vs. Daemons... beats me. Webway breach?

 Carnikang wrote:
This was actually addressed in the Tyranid Codex, on a world where Four Greater Deamons popped up after a big ritual, and a Hive Fleet swooped in. It was pretty great to read.

That was a good story..

So Clergy world, had a hidden chaos devise guarded by Grey Knights.. Nids rock up and start killing everyone, the Bloodletting activates the Device and 4 (Big Named) Greater Deamons come out with their respective hordes.. and instead of finding Souls to reap.. they are confronted by millions of soulless bugs eating everything

 Quarterdime wrote:
@Mudrat

You do know that at the very least the Eldar craftworlds are, to my knowledge, associated to different regions of space? In fact, there was an Eldar v. Tyranid campaign book published in 2014, I think it featured Iyanden. So the implication that I get from it is that Iyanden is in the galactic east, possibly farther out than the Tau Empire. And one of them circles the Eye of Terror, I think it was Biel Tan. I'm sure this information is floating around somewhere...

Craftworlds might be in specific location but since Eldars move around by webway which provides ability to go pretty much anywhere that path leads to fast it's less of importance where the craftworld itself is and more important where webway from that craftworld leads. They don't know all paths and some paths are broken so sometimes they have to hop between gates to get elsewhere. It's actually possible that say Biel-tan's could have working path that they know that leads to other side of the galaxy fast but have to take very long detour to get to planet within just few lightyears from the craftworld itself...

So there's no real way that you could say Iyanden eldars are mostly seen in galactic east. Sure CRAFTWORLD is there(as seen by it getting hit by Hive fleet but such fights against craftworlds are very rare. For one eldars keep them floating deep in space unknown to others since they can't really escape and are so bloody important and not needed to get elsewhere as such. Just need gates to webway to work) but when it comes to say appearing on specific planet it's less so where craftworld proper is and more of how webway paths go.

Oh and the craftworld around Eye is Ulthwe. Not sure why but I have image Biel-tan is more to galactic "south".

Lexicanum has a page for the various segmentums which includes notable planets/regions/etc.

It´s not much, but it´s a start.

http://wh40k.lexicanum.com/wiki/Segmentum