Guyana’s Googly at the ICJ: Prescription

May 12, 2026 Letters

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Dear Editor,

Guyana’s Prescriptive claim at the ICJ moves beyond the validity of the 1899 Award and into an alternative basis of territorial sovereignty under international law. Yes, prescription. Many scholars would argue that even if the 1899 Award were somehow weakened, which is highly unlikely, Guyana would still possess a very powerful prescriptive claim to the Zona de Reclamacion.

Let us untangle this carefully.

Prescription in international law is somewhat analogous to “adverse possession” in domestic property law. International law recognises and upholds it as a mode of territorial acquisition. In other words, courts recognise prescription as a valid and powerful claim to territorial sovereignty. Simply put, a state can acquire sovereignty over territory through an occupation that is long, continuous, peaceful, public, and uncontested exercise of authority. The idea is rooted in the international legal preference for stability, effectiveness, and finality of border settlement.

There are two major forms of prescription. International jurists generally distinguish between these two forms:

(A) Acquisitive Prescription. This is the classic doctrine. It recognises a state’s acquisition of territory as legal because it has exercised authority over territory for a prolonged period, openly and continuously, while the rival claimant either acquiesced, failed to protest effectively, or abandoned its claim in practice. This is the form of prescription most relevant to Guyana. Key ingredients in Guyana’s claim include effective administration, peaceful control, public acts of sovereignty, passage of time, and insufficient opposition by the rival state, Venezuela. Examples of sovereign acts include: policing, taxation, elections, mining licenses, land grants, infrastructure, courts, immigration control, resource concessions, military patrols, and local government administration. Guyana has done all of these in the Essequibo for decades.

(B) Extinctive Prescription (or Loss by Prescription). This is the reverse side of acquisitive prescription. A state may lose sovereignty because it failed to occupy and exercise authority, abandoned effective control, or slept on its rights while another state governed openly. This doctrine focuses less on the acquiring state and more on the passivity or neglect of the losing state.

In sum:

• acquisitive prescription = gaining sovereignty,
• extinctive prescription = losing sovereignty through inaction.

In practice, the two doctrines often overlap. The question remains:  Does Guyana have a strong prescriptive claim? In my humble assessment: yes, very strong — although Guyana’s primary legal argument remains the 1899 Award. Prescription is essentially Guyana’s Googly or its “backup fortress.” And here is why. Guyana’s strongest prescription argument is continuous and effective occupation and administration of Essequibo. For well over a century, the territory has been administered by British Guiana, and later independent Guyana.

This is classic effectivités — actual display of sovereign authority. International courts care deeply about this. On the other hand, Venezuela largely accepted the boundary for decades. Moreover, Venezuela has never occupied the Essequibo territory that it is now claiming or was the title of ownership transferred to Venezuela when it became an independent state. Reason: Spain cannot cede title that it never had or acquired.

This is one of Guyana’s strongest points. After the 1899 Award, Venezuela participated in boundary demarcation, accepted maps, and behaved for decades as though the boundary existed. And that period of relative acquiescence is legally important. Indeed, many analysts believe Venezuela’s long acceptance between 1899 and roughly 1962 seriously weakens its later attempt to reopen the matter. International Law disfavors states resurrecting dormant territorial claims generations later.

Acquiescence is very important in this case. And it does not require explicit consent. Silence or insufficient protest over a long period can matter enormously. If one state (Guyana) openly governs territory, while the other state (Venezuela) does not effectively contest that control, International Law shall gradually consolidate sovereignty to the administering state.

Does Venezuela have a counterargument? Yes. Venezuela would strongly resist the Prescription argument. Caracas would argue that it never abandoned its claim, that its protests existed periodically, that the 1962 repudiation interrupted any prescriptive period, and therefore no uncontested sovereignty ever crystallized.

That is not a frivolous counterargument. Prescription usually requires relatively weak or ineffective protest by the rival claimant. But once Venezuela formally revived its claim in 1962 and persisted with it, the prescriptive clock — at least arguably — stopped running. So, the key question becomes: Had Guyana/Britain already consolidated title before 1962? Many legal scholars would say: Yes.

Georgetown has reasons to celebrate. Its case remains especially strong. Even beyond Prescription, Guyana benefits from the convergence of multiple reinforcing doctrines:

(A) Arbitral title: The 1899 Award itself.

(B) Effectivités: Actual administration of the territory.

(C) Acquiescence: Venezuela’s long acceptance after 1899.

(D) Stability of boundaries: One of the strongest principles in International Law.

(E) Estoppel: A state may be prevented from reversing a position it long accepted.

Together, these create a cumulative legal weight that is very difficult to overcome.

And that is why Venezuela has focused so intensely on attacking the original 1899 Award itself. Because once the Court looks at 127 years of continuous and peaceful occupation and administration, recognized maps, governmental authority, settled populations, and international conduct, the legal terrain becomes increasingly difficult for Caracas. Guyana’s case before the ICJ is uncomplicated and straightforward, Venezuela’s is turbid to the point of opacity and seriously lacking legal legs to stand on.

Sincerely,

Prof. Daniel K Gibran

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