Vanuatu Files ICJ Case: Matthew Hunter Islands Dispute With France

• Vanuatu has filed an application with the International Court of Justice (ICJ) to resolve a territorial and maritime boundary dispute with France.
• The application seeks a determination of ownership for Umaenupne (Matthew Island) and Umaeneg/Leka (Hunter Island), and the establishment of a maritime boundary with New Caledonia.
• The ICJ cannot proceed with the case unless France consents to its jurisdiction, as stipulated by court rules.
• The dispute, stemming from Vanuatu's 1980 independence, has led to legal uncertainty for fishing and scientific research in the contested zones.
• Diplomatic efforts to resolve the Matthew Island Hunter Island ownership dispute have so far been unsuccessful.

The court's rules explicitly state that the case will not be entered into the General List, nor will any action be taken, unless and until France agrees to the court's jurisdiction for this particular matter.

The Pacific island nation of Vanuatu has formally approached the International Court of Justice (ICJ) in The Hague, seeking a definitive resolution to a long-standing territorial and maritime boundary dispute with France. On Monday, Vanuatu filed an application requesting the court to determine the rightful ownership of two remote, uninhabited islets, known to Vanuatu as Umaenupne and Umaeneg/Leka, and to France as Matthew Island and Hunter Island. This move aims to clarify sovereignty over these land features, which are crucial for defining maritime zones.

Beyond the question of island ownership, Vanuatu's application also presses for the establishment of a single, clear maritime boundary. This boundary would delineate the exclusive economic zones (EEZs) and continental shelves between Vanuatu and New Caledonia, a French overseas territory. The establishment of such a boundary is vital for managing marine resources and seabed rights in the region, impacting activities like fishing and scientific research.

However, the path to a judicial resolution is not straightforward. Vanuatu's application was filed under a specific ICJ procedure that mandates the consent of the respondent state—in this case, France—before the proceedings can advance. The court's rules explicitly state that the case will not be entered into the General List, nor will any action be taken, unless and until France agrees to the court's jurisdiction for this particular matter. The ICJ has already transmitted the application to the French government, which has yet to issue a public response.

The dispute over Matthew Island Hunter Island ownership dates back to Vanuatu's independence in 1980. Prior to this, the nation, then known as the New Hebrides, was jointly administered by Britain and France. While independence brought self-governance, the question of sovereignty over these two small islets, located to its south, remained unresolved. Vanuatu asserts its claim to Umaenupne and Umaeneg/Leka, while France maintains that Matthew and Hunter Islands are integral parts of New Caledonia, leading to conflicting claims over Umaenupne Umaeneg/Leka sovereignty.

This ongoing Matthew Island Hunter Island ownership dispute has significant practical consequences. According to a February 2026 statement from France's Foreign Ministry, the rival claims have directly impeded the countries' ability to fix their maritime boundary. This lack of a defined Vanuatu France maritime boundary claim creates considerable legal uncertainty for various economic activities, including commercial fishing and scientific research, within the contested zones.

Despite diplomatic efforts, an amicable solution has eluded both nations. Boundary talks were held in 2018 and 2019, and a pledge to resume negotiations and seek a friendly resolution was made in July 2025. However, France's foreign minister publicly reaffirmed Paris's claim to the islands in June 2026, underscoring the persistent disagreement. Vanuatu, home to approximately 336,000 people and situated about 1,090 miles east of northern Australia, now hopes the International Court Justice Vanuatu application will break this diplomatic deadlock.

The International Court of Justice, established under the United Nations Charter in 1945, serves as the principal judicial organ of the United Nations. Comprising 15 judges and based at the Peace Palace in The Hague, its primary functions include settling legal disputes between states and providing advisory opinions on international law to authorized UN bodies. However, a fundamental principle governing its contentious jurisdiction is the requirement for state consent, a factor that is now central to the Vanuatu application.

In this instance, the ICJ jurisdiction France consent is paramount. Unlike domestic courts, the ICJ cannot compel a state to appear before it without that state's explicit agreement. Vanuatu's application, therefore, represents an invitation for France to engage in judicial proceedings rather than an immediate commencement of a trial. Until France formally consents to the court's jurisdiction for this specific case, the application will remain at the court's doorstep, unable to proceed to a hearing or judgment. There is currently no deadline for France to provide its response, leaving the future of the International Court Justice Vanuatu application in abeyance.

This case highlights the critical role of state consent in international litigation before the ICJ, demonstrating that even when a nation seeks judicial clarity, the process is contingent on the willingness of the other party to participate. The ongoing legal uncertainty that unresolved territorial and maritime boundary disputes can create for economic activities like fishing and scientific research in contested zones underscores the broader significance of Vanuatu's application. Clear boundaries are essential for the sustainable management of marine resources and for avoiding potential conflicts.

The determination of exclusive economic zones and continental shelves directly impacts a nation's rights over marine resources and the seabed. For Vanuatu, resolving the ownership of Umaenupne and Umaeneg/Leka, and subsequently fixing its maritime boundary with France, is not merely a matter of historical claim but one of economic and environmental sovereignty. The current situation means that, for now, no hearing is scheduled, and there is no judgment to appeal, as the entire process awaits France's decision regarding the ICJ jurisdiction France consent.

This case highlights the critical role of state consent in international litigation before the ICJ and the ongoing legal uncertainty that unresolved territorial and maritime boundary disputes can create for economic activities like fishing and scientific research in contested zones.

Source: Original reporting via Courthouse News