Navigating Disputed Waters: The Legal Regime of Provisional Arrangements in Delimitation

Maritime boundary delimitation is often one of the most protracted and politically charged undertakings in international diplomacy. When coastal states possess overlapping maritime entitlements over the exclusive economic zone or the continental shelf, final boundary agreements can take decades to negotiate or adjudicate. In the interim, valuable offshore natural resources remain locked beneath the seabed, navigation rights require coordination, and environmental vulnerabilities demand unified stewardship.

To prevent gridlock, conflict, and economic paralysis in undelimited waters, international law established a distinct transitional mechanism. Codified under Articles 74(3) and 83(3) of the United Nations Convention on the Law of the Sea, known as UNCLOS, this regime governs state conduct during the transitional period pending final maritime delimitation. It balances the imperative of economic development with the preservation of diplomatic and judicial processes.

The Dual Architecture of Articles 74(3) and 83(3) UNCLOS

Articles 74(3) and 83(3) of UNCLOS govern the exclusive economic zone and the continental shelf respectively, employing identical treaty language. The provisions articulate two fundamental, interrelated obligations that apply during the transitional period prior to final boundary determination:

Pending agreement as provided for in paragraph 1, the States concerned, in a spirit of understanding and cooperation, shall make every effort to enter into provisional arrangements of a practical nature and, during this transitional period, not to jeopardise or hamper the reaching of the final agreement. Such arrangements shall be without prejudice to the final delimitation.

This statutory formula creates a dual regime characterized by a positive duty to negotiate transitional mechanisms and a negative duty of restraint. Crucially, the entire framework operates under the without prejudice rule, ensuring that any temporary compromise, joint exploitation agreement, or practical management scheme cannot be construed as a renunciation, concession, or recognition of sovereignty or sovereign rights in subsequent delimitation proceedings.

What are provisional arrangements of a practical nature?

The first limb of the obligation requires states to make every effort to negotiate and enter into provisional arrangements of a practical nature. International jurisprudence has confirmed that this obligation represents a duty of conduct rather than a duty of result. States are legally required to enter negotiations in good faith, meaningfully explore cooperative solutions, and refrain from adopting inflexible positions that reduce negotiations to a mere formality.

Provisional arrangements can assume a wide variety of legal, institutional, and technical forms depending on the specific characteristics of the disputed maritime area:

• Joint Development Agreements: Treaties establishing collaborative frameworks for the exploration and exploitation of non-living resources, primarily oil and gas, across overlapping entitlement claims.
• Provisional Fisheries Enclaves: Temporary management zones where coastal states harmonize fishing quotas, licensing schemes, and conservation enforcement without establishing a single sovereign line.
• Environmental and Maritime Safety Arrangements: Coordinated protocols for oil spill response, search and rescue operations, marine scientific research, and vessel traffic monitoring in overlapping zones.
• Moratoria on Sensitive Activities: Formal or informal bilateral agreements to freeze high-impact unilateral industrial activities while sustaining diplomatic boundary talks.

Because the law mandates practical arrangements, states possess extensive flexibility to design governance structures that bypass sovereign sensitivities while unlocking immediate economic and regulatory utility.

What is the duty not to jeopardize or hamper final delimitation?

The second limb of Articles 74(3) and 83(3) imposes a negative obligation: states must refrain from conduct that could jeopardize or hamper the reaching of a final agreement. This requirement acts as a vital safeguard against unilateral actions that alter the physical or legal status quo of the contested maritime zone.

The threshold between permissible and impermissible unilateral conduct was fundamentally clarified by the Annex VII Arbitral Tribunal in the landmark 2007 case Guyana v. Suriname. The Tribunal drew a crucial legal distinction between activities that result in permanent physical change to the marine environment and those that do not:

• Permissible Transitory Activities: Operations such as non-invasive seismic testing, acoustic seabed mapping, and standard marine scientific research do not cause permanent physical alterations to the seabed or subsoil. Consequently, they do not automatically breach the obligation not to jeopardize or hamper negotiations, provided they are conducted in a manner that does not aggravate the dispute.
• Impermissible Permanent Alterations: Unilateral exploratory drilling, permanent platform installation, and commercial extraction of hydrocarbon reserves create permanent physical changes in the disputed area. Such activities create a fait accompli, significantly increase bilateral tensions, and violate the duty of restraint under international law.

The duty not to jeopardize or hamper is therefore not a total ban on all unilateral state action, but an objective constraint against irreversible physical, economic, or legal disruption.

Can states exploit resources in disputed maritime areas?

A central question in offshore energy development is whether a coastal state may unilaterally extract oil, gas, or minerals from an undelimited continental shelf before a boundary is settled. Under contemporary international law, the answer is unequivocally restrictive.

Unilateral commercial extraction of non-living resources from an area of overlapping claims without the consent of the neighboring claimant violates both the sovereign rights of the affected neighbor and the explicit terms of UNCLOS Article 83(3). Because oil and gas reservoirs are non-renewable, unilateral extraction irreparably depletes the resource base, precluding the other state from ever enjoying its potential sovereign rights over that deposit.

This principle was underscored by the International Tribunal for the Law of the Sea (ITLOS) Special Chamber in the 2015 Provisional Measures Order in Dispute Concerning Delimitation of the Maritime Boundary between Ghana and Côte d'Ivoire. While the Special Chamber permitted Ghana to continue pre-existing drilling operations where wells had already been drilled to avoid catastrophic environmental and financial harm, it strictly prohibited any new exploratory or commercial drilling in the disputed maritime area pending the final judgment on delimitation.

How do joint development zones work under maritime law?

When neighboring states recognize that final delimitation is politically unfeasible in the short term, but wish to avoid leaving lucrative mineral deposits dormant, they frequently establish a Joint Development Zone (JDZ). A JDZ converts a contested area into a shared administrative region where revenues, costs, and management responsibilities are divided by mutual agreement.

State practice across diverse maritime regions has produced three primary operational models for joint development:

Every successful joint development treaty contains an explicit sovereignty clause affirming that the existence of the agreement, its administrative procedures, and the exploration activities conducted under it cannot prejudice the positions of the parties regarding the ultimate delimitation of their maritime boundaries.

Key Jurisprudence: From Guyana v Suriname to Ghana Côte d'Ivoire

The modern legal doctrine governing provisional arrangements has been forged primarily through international arbitral tribunals and judicial decisions. Three primary cases define the contours of this regime:

The Aegean Sea Continental Shelf Case (1976)

In the Aegean Sea Continental Shelf case between Greece and Turkey, the International Court of Justice considered whether Turkish seismic exploration of the contested continental shelf justified interim provisional measures of protection. The Court declined to order interim measures, observing that exploratory seismic testing via seismic vessels did not involve the establishment of permanent installations, the physical extraction of resources, or the risk of irreparable physical damage to the seabed.

Guyana v. Suriname (2007)

The 2007 Annex VII Arbitral Tribunal award in Guyana v. Suriname remains the foundational authority on the interpretation of Articles 74(3) and 83(3). The dispute arose after Surinamese naval vessels expelled a Canadian exploratory drilling rig licensed by Guyana from an undelimited area. The Tribunal made two groundbreaking findings:

1. Guyana breached its legal obligations under Article 83(3) by unilaterally authorizing exploratory drilling in disputed waters without consulting Suriname, as this constituted an activity causing permanent physical change that hampered the reaching of a final agreement.
2. Suriname breached its obligations under international law by resorting to the threat of military force rather than seeking dispute resolution mechanisms, reaffirming that the absence of a provisional arrangement does not permit unilateral armed enforcement.

Ghana / Côte d'Ivoire (2017)

In 2017, the ITLOS Special Chamber delivered its judgment on the merits in Ghana/Côte d'Ivoire. Côte d'Ivoire argued that Ghana had violated Article 83(3) by conducting extensive unilateral exploration and exploitation activities in the disputed area during bilateral negotiations. The Special Chamber held that although unilateral activities in disputed waters carry inherent risks, Ghana did not violate Article 83(3) because it had engaged in consistent negotiations in good faith and had paused new drilling operations in compliance with the Tribunal's earlier provisional measures order.

The Special Chamber clarified that a state is not automatically in breach of its obligation to seek provisional arrangements merely because negotiations fail to produce an agreement, provided that the state made genuine, continuous efforts to negotiate.

Environmental Obligations in Undelimited Maritime Areas

In recent years, the regime of provisional arrangements has evolved beyond resource exploitation to encompass comprehensive environmental protection. Under Part XII of UNCLOS, states have a general obligation to protect and preserve the marine environment. This obligation applies to undelimited maritime zones with equal legal force.

When activities are conducted within undelimited zones, claimant states share a responsibility to perform transboundary environmental impact assessments before authorizing offshore projects. When environmental risks such as transboundary oil spills or habitat degradation threaten shared marine ecosystems, unilateral inaction or non-cooperation can constitute an independent violation of international environmental law. Consequently, modern provisional arrangements almost universally incorporate joint environmental monitoring and emergency response protocols.

Conclusion: Balancing Sovereignty and Economic Necessity

The legal regime of provisional arrangements in maritime delimitation represents one of the most pragmatic innovations within modern public international law. By decoupling immediate economic utilization from definitive sovereign boundary determination, Articles 74(3) and 83(3) of UNCLOS provide a durable blueprint for managing maritime uncertainty.

The jurisprudence of international courts and tribunals has established a coherent equilibrium: coastal states must seek cooperative, non-prejudicial transitional solutions in good faith, while strictly refraining from unilateral physical actions that would prejudice the final settlement. Through joint development zones, unitisation schemes, and shared regulatory frameworks, the law of the sea ensures that overlapping maritime claims do not become drivers of regional conflict, but instead serve as catalysts for bilateral cooperation.