The Guyana-Venezuela Dispute over Essequibo

The Essequibo region spans approximately 159,500 square kilometers, making up about 70 percent of Guyana’s territory. Beyond its size, the region holds strategic and economic value that has made it the center of a dispute between Guyana and Venezuela.

What began as a colonial-era boundary disagreement now operates as a legal, diplomatic, and resource dispute before the International Court of Justice (ICJ). The conflict involves a contested arbitral award, offshore oil interests, Venezuelan nationalist mobilization, and Guyana’s control of a territory that it treats as integral to the state. The dispute intensified in 2023, when a Venezuelan referendum endorsed policies aimed at incorporating Essequibo into Venezuelan territory. Regional diplomacy reduced the immediate risk of armed conflict, but the underlying dispute remains active because the ICJ has not yet issued a final judgment on the merits.

Why Essequibo is contested

Essequibo is central to Guyana’s territorial integrity and economic future. The region contains several strategic minerals, including gold and bauxite. Its freshwater reserves and river systems also shape the ecological value of Guyana’s interior. More recently, the region has become critical to the global energy landscape due to substantial offshore oil discoveries along its Atlantic coast. Since 2015, exploration led by multinational companies — most notably ExxonMobil — has uncovered extensive petroleum reserves in the maritime area adjacent to the disputed territory. These discoveries have turned Guyana into one of the fastest-growing economies in the world, with proven reserves exceeding eleven billion barrels of oil. Much of this oil lies in the Stabroek Block, partially located within waters claimed by Venezuela.

For the Venezuelans, Essequibo represents a potential source of economic revitalization amid a prolonged crisis marked by sanctions and economic decline. The region’s natural wealth is seen in Caracas as essential to national development and energy security. Furthermore, Essequibo shares geological and ecological characteristics with Arco Minero del Orinoco, a prosperous mining area within Venezuela. This reinforces the Venezuelans’ belief that Essequibo is a portion of their own territory — if not politically, then according to natural borders.

Despite its large size, Essequibo is sparsely populated. It is home to around 125,000 people, approximately 15 percent of Guyana’s population. The majority of its inhabitants are indigenous communities who live in rural areas. These populations largely identify with Guyana and have shown little to no alignment with Venezuelan claims.

As natural resource competition intensifies and global demand for energy and minerals remains high, Essequibo’s geostrategic relevance is likely to increase.

History of the dispute

The dispute over Essequibo traces back to the colonial rivalries of the early modern period. During the 17th and 18th centuries, Spain and the Netherlands contested the territory while establishing settlements and trading posts in the region. By the early 19th century, Britain controlled the Dutch colonies of Demerara, Berbice, and Essequibo. In 1831, those colonies were consolidated into what became British Guiana.

Venezuela had declared independence from Spain in 1810 and considered the Essequibo region part of the territory inherited from the former Captaincy General of Venezuela. British and Venezuelan holdings lacked a clearly defined border. Because of that uncertainty, the dispute soon focused on where imperial claims ended and republican claims began.

In 1840, Britain commissioned a boundary survey by the German explorer Robert Schomburgk. His proposal became known as the Schomburgk Line. The Venezuelans rejected the British proposal for demarcation, because it placed key river access points — such as the Orinoco Delta — under British control.

Tensions escalated in the late 19th century following the discovery of gold in the disputed area. In 1887, Venezuela severed diplomatic ties with Britain. In 1895, it appealed to the United States for support by invoking the Monroe Doctrine. The U.S. government demanded that the matter be submitted to international arbitration. This assertive position by President Grover Cleveland would inspire the formulation of the Olney Doctrine, under which the United States claimed authority to intervene in diplomatic disputes in the American hemisphere. Britain ultimately agreed to arbitration. In 1899, an arbitral tribunal based in Paris ruled in favor of the British and granted them sovereignty over most of the contested territory.

Although Venezuela accepted the ruling at the time, dissatisfaction with the outcome persisted. Decades later, in 1949, a posthumous memorandum by a member of the Venezuelan-U.S. legal team alleged that the arbitral decision had been the result of a political compromise rather than a fair legal judgment. The memorandum claimed that the judges agreed to award Britain a partial but significant victory unanimously, instead of awarding the whole territory to Britain by a majority vote with two judges dissenting. This claim led Venezuela to denounce the arbitral award at the United Nations in 1962.

The growing internationalization of the issue culminated in the signing of the Geneva Agreement in 1966. The signatories were Venezuela, the United Kingdom and British Guiana, which became independent as Guyana soon afterward. That international treaty acknowledged the existence of a territorial dispute and committed the parties to seek a peaceful, practical and mutually satisfactory solution. Despite decades of negotiations, however, the matter remained unresolved, and Venezuela continued to assert that the 1899 arbitral award was invalid.

Since then, the dispute has resurfaced periodically, particularly in moments of internal political pressure in Venezuela or when economic interests in Essequibo gained new relevance. Both Venezuela and Guyana attempt to justify their territorial claims by making reference to the historical foundations of the dispute.

The escalation of tensions and the ICJ case

Despite the Geneva Agreement of 1966, negotiations between Venezuela and Guyana have yielded no definitive outcome. The creation of a mixed commission, and later the involvement of the United Nations through the appointment of good offices representatives, failed to produce consensus. In 2014, the death of the last UN-appointed facilitator and the declaration by the UN Secretary General that the bilateral talks had been unsuccessful marked the end of that mediation phase.

Tensions began to rise again in 2015, when the American company ExxonMobil announced major oil discoveries in Guyanese waters, within a contested maritime zone. The announcement came shortly after Guyana issued new exploration licenses to international companies, prompting a strong reaction from Caracas. The Venezuelan government issued a presidential decree extending its maritime boundaries to encompass the disputed waters, a move that Guyana denounced as an act of aggression and a violation of international law.

In March 2018, Guyana formally submitted a case to the International Court of Justice (ICJ). It asked the Court to affirm the validity of the 1899 Arbitral Award as a “full, final, and perfect settlement” of the boundary between the two countries. Venezuela refused to recognize the Court’s jurisdiction. Its government maintained that the ICJ could not unilaterally decide the issue without the consent of both parties. It insisted that the only acceptable path forward was bilateral negotiation. In July 2018, Venezuela formally stated that it would not participate in the proceedings. It also questioned the legal basis for the referral, arguing that the Geneva Agreement required mutual agreement before submitting the dispute to any judicial body.

Despite Venezuela’s objections, the Court proceeded. In December 2020, it issued a preliminary ruling declaring that it had jurisdiction to adjudicate the case, at least with regard to determining the legal status of the 1899 award and the subsequent boundary line. The ICJ decision was based on its interpretation of the Geneva Agreement and the authority of the UN Secretary-General to choose the means of settlement. This ruling was a significant legal victory for Guyana and paved the way for formal and compulsory legal proceedings over Essequibo.

The escalation of the dispute coincided with deepening political and economic crises within Venezuela. Facing international isolation and domestic opposition, the government of Nicolás Maduro increasingly emphasized the Essequibo issue in its rhetoric, presenting it as a matter of national sovereignty and historical justice. State media and official discourse portrayed the territory as part of Venezuela’s rightful heritage, fueling nationalist sentiment over the region. The Venezuelan government also began to use military pressure against the Guyanese oil sector. Its actions included detaining oil exploration vessels.

In subsequent submissions to the Court, Guyana defended the legitimacy of the 1899 arbitral award and the boundary demarcated thereafter. It emphasized the historical acceptance of the award for several decades, including the joint demarcation of the frontier and Guyana’s long-standing administrative control over Essequibo. Venezuela, while distancing itself from the proceedings, reiterated its position in political and diplomatic forums, claiming that the award was the result of collusion and undue political pressure on the arbitral tribunal.

By 2022, the ICJ proceedings were moving ahead. Guyana presented its written memorial. The Court then granted Venezuela time to file a counter-memorial, should it decide to take part. As the legal process advanced, Caracas intensified its nationalist messaging and began to mobilize domestic public opinion. This was in line with the Venezuelan view that the dispute was not only a legal matter but also a political one.

The 2023 crisis and the Argyle Declaration

In 2023, the Guyana-Venezuela dispute escalated dramatically when the Venezuelan government organized a national referendum about Essequibo.

On December 1st, the ICJ issued a provisional measure ordering Venezuela not to take any action that would alter the current situation on the ground or interfere with Guyana’s administration of the territory. Despite this ruling, Caracas held the plebiscite on December 3rd and posed five questions to the Venezuelan electorate about the government’s policy toward the region. According to official figures, more than 95 percent of voters supported the proposals. Those proposals included incorporating Essequibo into Venezuelan territory and granting Venezuelan citizenship to its inhabitants. However, the legitimacy of the referendum was widely questioned, both due to its consultative nature and due to the absence of any vote within the disputed territory itself.

Following the referendum, President Nicolás Maduro announced a series of measures to implement its outcome, which were seen as direct threats to Guyana’s sovereignty and territorial integrity:

• The unveiling of a new official map of Venezuela that incorporated the Essequibo region.
• The creation of the Venezuelan state of “Guayana Esequiba”, having the city of Tumeremo as its administrative capital.
• The establishment of a High Commission for the Defense of Guayana Esequiba.
• The granting of licenses to Venezuelan state-owned enterprises in the oil and mining sectors to operate in the region.

Because Guyana requested support from regional and international partners, the international response to these moves was swift. Several countries expressed concern over the developments. The United States conducted joint military overflights with Guyanese forces, signaling support for Georgetown and regional stability. The United Kingdom also deployed a naval vessel to the area. These maneuvers were met with criticism from Venezuela and raised fears of an armed escalation. Brazil, which borders both disputing countries, adopted a cautious stance. It reinforced military presence in its northern region while emphasizing the need to avoid conflict. In addition, the Brazilian government offered Brasília as a venue for further dialogue.

In response to growing tensions, diplomatic efforts were reactivated. On December 14th, the presidents of Guyana and Venezuela met in Saint Vincent and the Grenadines under the auspices of the CELAC, the Community of Latin American and Caribbean States. Regional actors also participated, including Brazil’s special advisor for international affairs, Celso Amorim. The meeting resulted in the Argyle Declaration for Dialogue and Peace, in which both parties agreed to refrain from the use of force and to resolve the dispute in accordance with international law. They also committed to creating a joint commission of foreign ministers and technical experts and scheduled a follow-up meeting in Brazil.

The Argyle Declaration temporarily de-escalated the crisis, but the underlying territorial disagreement remains unresolved. Venezuela has not renounced the measures taken after the referendum, and Guyana continues to assert its rights under the 1899 arbitral award.

Tensions also continued after Argyle. In 2025, Guyana returned to the ICJ after Venezuela announced plans to hold elections for authorities in the purported “Guayana Esequiba” state.

On May 1, 2025, the Court reaffirmed its 2023 provisional measures and ordered Venezuela to refrain from conducting, or preparing to conduct, elections in the territory in dispute, which Guyana administers. Venezuela rejected the order, preserving the gap between the Court’s legal process and Caracas’s political position. By May 2026, the case had reached oral hearings on the merits, leaving the final judgment pending.

Conclusion

The Essequibo dispute, rooted in colonial-era boundaries and a contested arbitral award, has evolved into one of the most significant territorial controversies in present-day Latin America. While the region remained relatively stable for much of the twentieth century, recent discoveries of oil and other natural resources have dramatically raised the stakes. The economic value of Essequibo has turned a historical disagreement into a contemporary geopolitical issue, involving not only Venezuela and Guyana but also neighboring states and global powers.

The future of Essequibo will depend on the ICJ’s final judgment, the parties’ willingness to manage the dispute without force, and the regional actors that can keep legal disagreement from turning into military confrontation. Guyana controls the territory and treats the 1899 award as the legal boundary. Venezuela rejects that premise and presents the Geneva Agreement as the proper basis for negotiation. That institutional split is why Essequibo remains a durable territorial dispute even when open war is not the most likely outcome.