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I have a simple question, actually two, that I've searched for a good answer about. I'm looking at the disputes in the South China Sea.

First, what happens if two Exclusive Economic Zones (EEZ) overlap? How do you determine rights if, for example, the 220 mile EEZ of Vietnam overlaps the EEZ of China?

Second, can a sovereign be wholly territory inside another country's EEZ? Since an island generate its own EEZ, you would have question #1 above where the EEZs overlapped if your island was inside the EEZ of another country. For example, if the People's Republic of China assert its authority over an island in the Philippines's EEZ, what respective rights do the parties have for resource extraction, fishing, etc?

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    EEZ = Exclusive Economic Zone. In my mind, "exclusive" and "overlap" are contradictory, but I know nothing about the topic. Mar 18 at 2:27
  • Perhaps it is better phrased - what if the notional 220 mile EEZ were to overlap with another notional 220 mile EEZ. Which side prevails?
    – Abcderia
    Mar 18 at 2:42
  • If the EEZs are recognized by the UN, I assume they cannot overlap. Have you taken a look at the current disputes between Greece and Turkey? Mar 18 at 2:56
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As pointed out in a comment, exclusive zones cannot overlap by definition, given the meaning of "exclusive."

Your question is answered in the Wikipedia article you link to:

Generally, a state's exclusive economic zone is an area beyond and adjacent to the territorial sea, extending seaward to a distance of no more than 200 nmi (370 km) out from its coastal baseline. The exception to this rule occurs when exclusive economic zones would overlap; that is, state coastal baselines are less than 400 nmi (740 km) apart. When an overlap occurs, it is up to the states to delineate the actual maritime boundary. Generally, any point within an overlapping area defaults to the nearest state.

(Emphasis added; footnotes omitted.)

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Distance from land and bilateral contracts.

In the North Sea the jurisdictions of Noway, Denmark, Germany, the Netherlands, Belgium, England, Scotland create almost a full circle around, leaving only a gap in the Iceland-bound area. There's a spec of Denmark that way, but that's typically not seen as in the North Sea. Where not otherwise possible, the EEZ maps for the area use the 12 Miles zones around any islands, but everywhere else extending to pretty much the mid of the North Sea. It is the general agreement that, where any zones would overlap, the exact middle is taken as the edge between them - or things are taken to court or politics.

enter image description here

Germany and the Netherlands did take the political route from 2012 to 2014, when they tried figuring out the Dollart Bay border between the two:

enter image description here

They established a special zone, in which the rules for construction and such are to be done separately from the actual borders based on some kind of demarcation line. But they only solved who is to be responsible for managing that stuff, not who is the actual owner of either side.

On the court route, in 1999, the Hague Permanent Court of Arbitrations decided that islands between Yemen and Eritrea are not to be taken into account for the EEZ and the exact middle between the mainland is to be taken. 2009 saw the UN ICJ rule that islands do not extend EEZ in the case over Snake Island and any island only projects the minimum 12-mile zone.

However, as we know from Greece, Cyprus, and Turkey: what constitutes an island and what mainland is very much up to discussion, especially in the case of Cyprus which might or might not be an island.

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They sort it out with this

enter image description here

If sovereign nations don’t agree about sovereignty and won’t submit to independent dispute resolution, they use force to determine the issue.

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    99.9% of these disputes are solved at the chart table and in the UN, only exceedingly rarely in open warfare.
    – Trish
    Mar 18 at 8:56
  • @Trish Just as the lion's share of legal cases are settled in the shadow of what would happen in a trial, the lion's share of boundary disputes that are solved at the chart table do so in the shadow of what would happen if the parties went to war over them.
    – ohwilleke
    Mar 18 at 9:51
  • @ohwilleke true, the threat of war or military actions is in the backdrop of the Chart tables and adjudication rooms. But that doesn't mean that they are the norm - as the examples I pulled out.
    – Trish
    Mar 18 at 10:22
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    @Trish the image does not depict open warfare but a display of military power.
    – phoog
    Mar 19 at 12:17
  • (-1) That's simply untrue. What nations actually do all the time is resort to other forms of power or influence, for example inducing other countries to take a side by promising them investments or denying them something they want, all the way to economic sanctions. More often than not, countries are also happy to keep the issue frozen rather than force a quick resolution at all costs. Importantly, a threat to use force comes with its own costs and is not credible if your core interests are not at stake (and your counterpart doesn't believe they are, cf. Falklands).
    – Relaxed
    Apr 21 at 13:48

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