Maritime Delimitation in the Black Sea (Romania v. Ukraine) [2009]

ICJ Reports 2009, p. 61 · International Court of Justice · International

Law of the Sealaw-of-the-seamaritime-delimitationEEZcontinental-shelfthree-stage-approach

Issue

How should the maritime boundary between Romania and Ukraine be delimited, and what effect should Serpents' Island have on the delimitation?

Held

The Court delimited a single maritime boundary using a three-stage approach. Serpents' Island was given no effect in the delimitation because it was a rock under Article 121(3) UNCLOS and its location would cause a disproportionate effect. The provisional equidistance line was adjusted to account for the concavity of the Romanian coast and the presence of Serpents' Island.

Exam use

Memorize the three-stage approach: provisional equidistance line, adjustment for relevant circumstances, disproportionality check. In problem questions, identify relevant circumstances such as cut-off effect, coastal lengths, and island status. Use Serpents' Island to argue that small features should not dominate delimitation. Be precise about Article 121(3) criteria.

Summary

The ICJ delimited the continental shelf and exclusive economic zone between Romania and Ukraine in the Black Sea. The Court established a three-stage methodology: (1) construct a provisional equidistance line, (2) adjust for relevant circumstances, and (3) check for disproportionality. The Court rejected Ukraine's claim that Serpents' Island should generate full maritime entitlements, treating it as a rock under Article 121(3) UNCLOS.

Facts

Romania and Ukraine had overlapping claims to the continental shelf and EEZ in the Black Sea. The key dispute involved Serpents' Island, a small island located about 20 nautical miles east of the Danube delta. Ukraine argued that the island should be given full effect in delimitation, while Romania contended it was a rock incapable of generating an EEZ or continental shelf. The coasts of both states were adjacent and opposite in parts. The area was potentially rich in oil and gas.

Procedural History

Romania instituted proceedings at the ICJ in 2004 after negotiations failed. The Court delivered its judgment on 3 February 2009. The decision is final and binding.

Issue

How should the maritime boundary between Romania and Ukraine be delimited, and what effect should Serpents' Island have on the delimitation?

Held

The Court delimited a single maritime boundary using a three-stage approach. Serpents' Island was given no effect in the delimitation because it was a rock under Article 121(3) UNCLOS and its location would cause a disproportionate effect. The provisional equidistance line was adjusted to account for the concavity of the Romanian coast and the presence of Serpents' Island.

Ratio Decidendi

The delimitation of the continental shelf and EEZ should follow a three-stage process: (1) construct a provisional equidistance line, (2) adjust it for relevant circumstances to achieve an equitable result, and (3) verify that the result is not disproportionate. Small islands that are rocks under Article 121(3) should not be given full effect if they would distort the boundary.

Obiter Dicta

The Court noted that the three-stage approach is now standard in delimitation cases. It also clarified that the 'relevant circumstances' test is flexible and case-specific.

Reasoning

The Court began by identifying the relevant coasts and constructing a provisional equidistance line. It then considered relevant circumstances: the concavity of the Romanian coast (which would cut off Romania's projection), the length of the coasts, and the status of Serpents' Island. The Court found that Serpents' Island was a rock under Article 121(3) because it could not sustain human habitation or economic life of its own. Giving it full effect would cause a disproportionate cut-off effect. The Court adjusted the line by giving Serpents' Island no effect and shifting the boundary to the south. Finally, it checked for disproportionality by comparing the ratio of coastal lengths to the ratio of allocated areas, finding no significant disproportion.

Plain-English Explanation

When Romania and Ukraine could not agree on their maritime boundary in the Black Sea, the International Court of Justice used a clear three-step method. First, it drew a temporary line equidistant from their coasts. Second, it adjusted that line because of special factors: Romania's coastline was concave (curving inward), which would give it less area, and a small island called Serpents' Island was a 'rock' under the law of the sea, not a full island, so it could not claim a large zone. Third, the Court checked that the final line was not unfairly disproportionate. This method is now the standard way to draw maritime boundaries.

Essay-Ready Explanation Generator

Version 1 of 4

Reference to Maritime Delimitation in the Black Sea (Romania v. Ukraine) (ICJ Reports 2009, p. 61) strengthens a Law of the Sea answer because the case reflects the principle that The delimitation of the continental shelf and EEZ should follow a three-stage process: (1) construct a provisional equidistance line, (2) adjust it for relevant circumstances to achieve an equitable result, and (3) verify that the result is not disproportionate. Small islands that are rocks under Article 121(3) should not be given full effect if they would distort the boundary. Applied to a problem question, the case should be used after identifying the issue as How should the maritime boundary between Romania and Ukraine be delimited, and what effect should Serpents' Island have on the delimitation? The stronger essay move is to connect the material facts to the court's holding, then explain whether the present facts support the same conclusion or justify distinguishing the authority.

Underlying Concepts

  • three-stage delimitation
  • provisional equidistance line
  • relevant circumstances
  • cut-off effect
  • Article 121(3) rocks

Precedents Applied

  • North Sea Continental Shelf Cases 1969
  • Continental Shelf (Libya/Malta) 1985

Later Treatment

  • Bay of Bengal (Bangladesh/Myanmar) 2012
  • Nicaragua v. Colombia 2012
  • Ghana/Côte d'Ivoire (ITLOS) 2017

Key Passages

  • The delimitation method to be employed is the three-stage approach.

Significance

This case is the leading authority for the three-stage delimitation methodology under UNCLOS. It clarified the treatment of islands under Article 121(3) and the concept of 'cut-off effect' as a relevant circumstance. The case is widely cited in subsequent delimitation disputes, including the Bangladesh/Myanmar and Nicaragua/Colombia cases.

Related Cases

Exam Tips

Memorize the three-stage approach: provisional equidistance line, adjustment for relevant circumstances, disproportionality check. In problem questions, identify relevant circumstances such as cut-off effect, coastal lengths, and island status. Use Serpents' Island to argue that small features should not dominate delimitation. Be precise about Article 121(3) criteria.

Revision Checklist

  • Name the issue before discussing facts so the marker sees the legal question immediately.
  • State the holding in one sentence, then use the ratio to explain why the court reached that result.
  • Use the citation and jurisdiction to show why this authority matters for the problem you are answering.
  • Pair this case with one supporting or contrasting authority if the question tests limits, policy, or exceptions.

Problem Question Use

In a problem question, apply the three-stage approach step by step. Identify the relevant coasts, construct a provisional line, then argue for adjustments based on relevant circumstances (e.g., cut-off effect, presence of islands). Use the disproportionality test as a final check. The case is especially useful when a small island is claimed to generate a large zone.

Common Pitfalls

  • Forgetting the disproportionality check
  • Treating all islands as generating full EEZ
  • Ignoring the cut-off effect as a relevant circumstance

Sources