One of the most common things that happens in Star Trek (at least TNG, with which I am the most familiar) is that two starships from two nations/empires will encounter each other, and neither seems to have a better claim to being there than the other. They'll squabble over the rights to a planet, or to searching the area, or simply to being "here." But with several notable exceptions (such as the Neutral Zone), they don't seem to claim that the other is trespassing very often. Obviously, it does happen, but it is also very common for neither ship to make a claim on the local territory in a national sense.

This would seem to imply that, like European ships in the Atlantic, there are wide expanses of space that are unclaimed and equally traversable by all. When a Federation starship, a Romulan warbird, and a Klingon bird of prey are in an argument, and none claims jurisdiction, it would imply that none has jurisdiction. It paints a picture, again like European naval powers, of national claims extending only X distance from the "shore" (in this case, a citizen planet), with wide expanses of "neutral" territory in between.

For example, this map of modern "territorial waters" shows that most of the ocean remains mutually unclaimed (by treaty, in this case):

Territorial Waters

And yet, every map of the Star Trek galaxy that I can find seems to be pretty filled up, more like the landmasses of Earth, where each nation butts right up against its neighbors and national territories are contiguous and unbroken:

Star Trek Map

Now, obviously even the thinnest of margins on a galactic scale allows for room to maneuver, and the galaxy is 3-dimensional so there may be nuances that don't make it onto the map. But still, it is hard to imagine how some of the events played out. For example, in The Chase, ships from the Romulan, Klingon, Cardassian, and Federation fleets are racing from world to world in what seems to be neutral territory. According to the map above, at least one of the first three ships would have had to travel straight through the Federation (or an incredible distance around it on the Z-axis) to be in competition with the others.

So my question is this: Is the territory of the Federation (or any other galactic empire) fully contiguous and bordered by neighboring territories? Or is the map more complex than the above example, featuring spaces within a nation's territory that allow other ships to pass through, so long as they didn't approach any claimed planets?

Put another way, is galactic space more like the Caribbean on the above map of Earth, completely claimed by one nation or another, or more like the south Atlantic, where individual star systems are claimed but there remains traversable space in between?

  • im not sure if the federation has rules about people entering their space, the nutral zone is inplace because the romulans dont like anyone into their space, and the klingons are generally angry about it too, but generally i assumed fed space was a free zone that the fed basically watched so if u attacked a ship ect they would interfere but otherwise you were free to do watev. i dont think you have to declare yourself to enter federation space *
    – Himarm
    Commented Nov 21, 2014 at 17:48
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    And yet we do, occasionally, see Picard chastising an alien ship for being in Federation space. This would seem to imply that they aren't allowed there, which would then suggest that when he doesn't comment on it, they aren't transgressing and thus aren't in Federation space.
    – Nerrolken
    Commented Nov 21, 2014 at 17:51
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    @Zibbobz In this case, I'm defining "unclaimed" as a planet or area which no power feels they can make the others leave. For example, in "The Pegasus" Picard has a chilly conversation with a Romulan about why they're both scanning the same system. They each claim to be doing scientific research, and neither tries to kick the other out of the area. For the purposes of this question, that would indicate that the system in question is "unclaimed," and not in either Romulan or Federation or Neutral Zone territory.
    – Nerrolken
    Commented Nov 21, 2014 at 17:57
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    Phil Farrand complains about this in "Nitpicker's Guide to Deep Space 9". It looks like the Federation (and other empires) claim vast areas of space, not just planetary or solar system space. Interestingly, after the Federation enters the wormhole and the Dominion claims they own the space in the Gamma Quadrant, the Federation pretty much ignores this claim.
    – user1197
    Commented Nov 22, 2014 at 17:37
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    @barrycarter: Are you implying that the Federation acts hypocritically? What are you, a filthy Maquis? Commented Nov 23, 2014 at 1:03

2 Answers 2


In the absence of a detailed, canonical map -- which doesn't exist -- it's hard to give a canonical answer.

However, scripts generally seem to treat boundaries more like countries on a continent, particularly when it comes to boundaries between powers who are not fully at peace with one another. Example: Star Trek: The Undiscovered Country, USS Excelsior is explicitly told to remain on the Federation side of the Neutral Zone. Similarly, all the way back in TOS: "Balance of Terror", there's a Neutral Zone boundary with the Romulans, the crossing of which is an act of war. The fan-made map you post above even shows the neutral zone monitoring stations along those two borders.

An argument could be made that these are special cases representing known hostile governments, but they're the main examples we have for questions of violations of territory. We know that at one time there was also a volume of space disputed by the Klingons and the Federation that the Organians insisted the two must learn to share as a volume, with claims to individual planets going to the side with the best development plan (we see this most explicitly in "Trouble with Tribbles").

This implies that there could at least have been a period in which that part of space was riddled with exceptions -- a Federation planet here, a Klingon system over there -- and that the treaty probably required each side to guarantee access to the others' worlds. By Star Trek: The Search for Spock, however, the Organians appear to have evaporated, and the treaty along with it. There's a whole wealth of potentially unexplored stories for what happened in that interim, but all we know in the end is that the accident on Praxis forced a more mundane peace treaty upon the Klingon Empire.

  • Indeed Michael, isn't there an episode where "a border" is literally shown as, like, "a really extremely large fence" (made up of regularly spaced floating thingies) - (mind you, I'm possibly conflating with Last Starfighter ! :O )
    – Fattie
    Commented Mar 14, 2018 at 21:56
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    @Fattie Yes. "Balance of Terror" shows the Romulan Neutral Zone and its monitoring stations. Commented May 17, 2018 at 17:44
  • good one, @Michael Scott Shappe !
    – Fattie
    Commented May 17, 2018 at 18:37

Your World Map does not show territorial waters, rather it shows Exclusive Economic Zones (EEZ's) which go out to 200 nmi, all vessels can transit the 12-200 nmi zone, but only the host can use those the economic resources in those zones, aside from transit. This may be akin to what Star Trek Maps show, not actual territory, an "EEZ" of sorts.

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    this is totally true, and should not be downvoted.
    – Fattie
    Commented Mar 14, 2018 at 21:55

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