The Two Great Deceits: How Mauritius Rewrote Its Borders to Seize the Sea – The 1982 Amendment Behind the Chagos Claim

By Outreach Coordination Desk
Maldivians for Chagos – Maldives–Chagos Sovereignty Initiative

The Great Assumption Behind a Global Mistake

It began as a celebration of freedom. In March 1968, the Republic of Mauritius was born, a small island nation emerging from the British Empire. Yet even at its birth, the new state was already missing a part of itself that Britain had carved away three years earlier. Under the British Indian Ocean Territory Order 1965, the Chagos Archipelago was excised from the Colony of Mauritius to form a new dependency, the British Indian Ocean Territory (BIOT). When the Mauritius Independence Order 1968 came into force, it defined Mauritius by reference to “the territories comprised in the Colony of Mauritius immediately before the appointed day.” Since Chagos had already been removed from that colony, it did not form part of Mauritius’s constitutional territory at independence. No Chagos constituency existed. No Chagossian voted in a Mauritian election or appeared in its registers.

Fourteen years later, as the world gathered in Montego Bay to sign the United Nations Convention on the Law of the Sea (UNCLOS), Mauritius quietly altered this historical record. The Interpretation and General Clauses (Amendment) Act 1982 inserted, for the first time, a new definition of “State of Mauritius”, one that suddenly included the Chagos Archipelago, including Diego Garcia. By the time Mauritius acceded to UNCLOS in 1994 and enacted the Maritime Zones Act 2005 and Baselines and Delineating Lines Regulations 2005, it had converted that insertion into maritime law, claiming vast Exclusive Economic Zones drawn from territory it never possessed.

Thus, a territory constitutionally absent in 1968 reappeared in 1982, not through decolonisation, but through legislation. What began as Britain’s act of detachment became Mauritius’s calculated annexation, disguised in the language of international law and left unchallenged by those who should have known better.

The First Deceit: Chagossians Were Never Mauritian Citizens

The first deceit is the oldest and the most fundamental. The people of the Chagos Archipelago were never Mauritian by law, registry, or representation. The administrative record leaves no doubt. Following the creation of BIOT in 1965, all governance and documentation, births, marriages, deaths, and employment were handled under British authority. The UK Foreign, Commonwealth & Development Office (FCDO) confirms in its 2024 record digitisation project that the BIOT birth and death registers “were retained by the BIOT Administration following the creation of the Territory.” Every certificate from 1878 to 1971 bears the title “Registrar of Births and Deaths for the British Indian Ocean Territory.”

In 1984, BIOT passed its own Births and Deaths Registration Ordinance (A.2), separate from Mauritius. Employment ledgers such as “Confidential Wages and Conditions of Employment – Copra Plantations, Chagos Archipelago” (BIOT Commissioner, 1968) were signed under BIOT authority, never by Port Louis. Not one Chagossian appeared on a Mauritian voter roll or census. No Chagos constituency existed.

Yet the International Court of Justice (ICJ) in Legal Consequences of the Separation of the Chagos Archipelago from Mauritius in 1965 (ICJ Reports 2019, p. 95), the UN General Assembly in Resolution 73/295 (2019), and the International Tribunal for the Law of the Sea (ITLOS) in Mauritius v. Maldives (Case No. 31, 2021) each accepted, without verifying constitutional documents, the assumption that Chagos had been part of Mauritius. None examined the 1968 Independence Constitution or its twenty-one constituencies. Thus, a global legal narrative rests on a colonial falsehood: that Chagossians were Mauritian citizens when they never were.

The Second Deceit: Rewriting Borders to Capture the Sea

The second deceit was executed with precision and timing. As the world ratified UNCLOS in 1982, Mauritius rewrote its borders at home. The Interpretation and General Clauses (Amendment) Act 1982 unilaterally declared Chagos part of its territory. Twelve years later, Mauritius acceded to UNCLOS (UN Treaty Series, 4 November 1994), granting it potential maritime rights over 2.3 million square kilometres of ocean, rights built upon a claim it never held at independence.

The pattern is undeniable: 1968 → omission. 1982 → insertion. 1994 → accession. 2005 → implementation. The sequence mirrors a deliberate legal design: rewrite borders, then weaponise the law of the sea to capture resources. Mauritius turned a colonial detachment into a maritime inheritance. The act was not an oversight; it was a calculated expansion masked as decolonisation.

Mauritius’s “Maritime Zones Act 2005″ and “Baselines and Delineating Lines Regulations 2005″ gave it the machinery to claim and enforce maritime boundaries as if Sovereignty over Chagos were already confirmed. These laws allowed Port Louis to issue licenses, claim seabed resources, and negotiate maritime limits; all under the false assumption that Chagos was constitutionally Mauritian. But under UNCLOS, only sovereign coastal States may generate maritime zones. By legislating as if ownership were settled, Mauritius acted ultra vires, converting an unverified claim into a basis for jurisdiction – a textbook case of juridical opportunism.

Resolution 2066 and the UN’s Defect

When the United Nations General Assembly passed Resolution 2066 (XX) in 1965, condemning Britain’s detachment of Chagos from Mauritius, it relied on flawed colonial reports that described Chagos as part of the “Mauritius Colony.” In reality, no such constitutional or electoral link existed. The phrase “people of Mauritius” in that resolution excluded the Chagossians entirely, who were under separate administration.

This is not merely a historical error; it is a procedural defect within the UN system itself. Under Article 73(e) of the Charter, both the Maldives and Chagos should have been listed as Non-Self-Governing Territories in 1946. Their omission enabled Britain to detach Mauritius and later appropriate it without UN review. The defect survives today, replicated in every ruling and resolution that assumed Mauritius’s claim as fact.

Global Condemnation and Colonial Silence

In the 1960s, the world rightly condemned Britain for creating BIOT. The Organisation of African Unity (OAU) denounced it in Resolution 16 (I) of 1967 as a violation of Resolution 1514 (XV). The Non-Aligned Movement (NAM) at Lusaka (1970) warned against “the fragmentation of dependent territories.” During UN debates, states from the Soviet Union to India called BIOT “imperialist cartography.” Yet when Mauritius annexed Chagos by statute in 1982, those same movements were silent.

Both London and Port Louis now guard their archives. Britain, its 1965 communications and Mauritius, its 1982 Cabinet minutes, while the UN has never revisited its own failure to list Chagos as a separate territory. The coloniser was condemned, but the successor’s deceit was ignored.

Under the 1973 International Convention on the Suppression and Punishment of the Crime of Apartheid, the systematic exclusion of a people from their land and governance on racial or colonial grounds is a crime under international law. The displacement of “Chagosian Maldivians” from Chagos and the denial of representation to its descendants fit precisely within that frame, a forgotten apartheid of geography.

A Plea to the Conscience of the Global South

Today, the Chagos question is not a bilateral dispute. It is a test of the rule-based international order itself. The African Union, successor to the OAU, must re-examine its stance: a claim born of constitutional falsification cannot be shielded by solidarity. The Non-Aligned Movement, founded to defend the decolonised world, must reclaim its moral clarity. The Eastern and former Soviet traditions, once champions of anti-imperialist justice, must confront this inherited lie.

If the international system is to endure as a moral enterprise, it must first correct its own defects. The Maldives and Chagos should be formally recognised under Article 73(e) as territories omitted through historical error. Britain and Mauritius should suspend their 2025 treaty until the original populations, including the descendants of Maldivians displaced by the empire, are properly identified and heard.

This is not a revision of history but a restoration of truth. Only by acknowledging that Chagossians were never Mauritians, and that Mauritius rewrote its borders to capture the sea, can the world reclaim the credibility of decolonisation. Law must be stronger than lies, and justice stronger than convenience.

Verified References

British Indian Ocean Territory Order 1965 (UK Statutory Instrument No. 1920).
Mauritius Independence Order 1968, Schedule 2, Section 39 (Constituencies).
Interpretation and General Clauses (Amendment) Act 1982 (Mauritius, Section 2).
Constitution of the Republic of Mauritius 1992, Section 111.
United Nations Convention on the Law of the Sea (UNCLOS, adopted 10 December 1982; in force 16 November 1994; Mauritius accession 4 November 1994, UNTS).
Maritime Zones Act 2005 and Baselines and Delineating Lines Regulations 2005 (Mauritius Gazette).
Legal Consequences of the Separation of the Chagos Archipelago from Mauritius in 1965 (ICJ Reports 2019, p. 95).
Mauritius v. Maldives (Preliminary Objections) (ITLOS 2021, Case No. 31).
UNGA Res. 2066 (XX) (1965); 1514 (XV); 1541 (XV); 73/295 (2019).
OAU Council of Ministers Res. 16 (I) (1967).
NAM Lusaka Declaration (1970).
International Convention on the Suppression and Punishment of the Crime of Apartheid (GA Res. 3068 (XXVIII), in force 18 July 1976).
ILC Draft Conclusions on Jus Cogens (A/77/10, 2022).
UK FCDO, Digitisation of Chagossian Records 1878–1971 (GOV.UK, 2024).