Home Articles posted by Constantinos Yiallourides

Part II: Analysis of Dispute Concerning Delimitation of the Maritime Boundary between Ghana and Côte d’Ivoire in the Atlantic Ocean

Published on October 20, 2017        Author:  and

An overview of the Ghana/Côte d’Ivoire judgment is provided in the first part of this post. The purpose of this second part is to highlight issues of practical significance which flow from the judgment.

In two important ways, the Ghana/Côte d’Ivoire judgment has demonstrated the functionality of dispute resolution processes under Part XV of UNCLOS, both in the context of maritime delimitation disputes and more generally.

Consistency with international delimitation jurisprudence

First, the ITLOS Special Chamber evidenced a desire to contribute to the development of consistent delimitation jurisprudence, and confirmed that the ‘equidistance/relevant circumstances method’ is now standard in a delimitation process – regardless of whether the coasts of claiming States parties are opposite or adjacent to one another. Importantly, it adhered to the three-step methodology identified and employed by the International Court of Justice (ICJ) in Black Sea. It did so by drawing a provisional equidistance line between the relevant coasts, considering the factors which might warrant adjustment of that line, and then applying an ex-post facto (dis)proportionality test to verify that the delimitation line was equitable. Notably, the Special Chamber maintained consistency with recent maritime delimitation jurisprudence by underscoring the primacy of criteria associated with coastal geography (concavity, coastal length, etc.) and ignoring factors related to offshore oil activities or the presence of seabed resources in the relevant area. Read the rest of this entry…


Part I: Analysis of Dispute Concerning Delimitation of the Maritime Boundary between Ghana and Côte d’Ivoire in the Atlantic Ocean

Published on October 19, 2017        Author:  and

On 23 September 2017, the Special Chamber of the International Tribunal for the Law of the Sea (ITLOS) rendered an award in Ghana/Côte d’Ivoire. It is only the second case, following the Guyana/Suriname Arbitration of 2007, in which an international adjudicating body has ascertained the meaning and scope of Articles 74(3) and 83(3) of the United Nations Convention on the Law of the Sea (UNCLOS) within the context of unilateral oil and gas operations in disputed areas.

The Special Chamber delimited the parties’ territorial sea, exclusive economic zone (EEZ) and continental shelf boundaries within and beyond 200 nautical miles (nm) with the boundary being an unadjusted equidistance line favouring Ghana. Other key questions for adjudication were a) Ghana’s claim regarding a long-standing, tacit agreement as to the existence of a maritime boundary and b) Côte d’Ivoire’s allegation that, by continuing with oil activities in the disputed area, Ghana had violated its Article 83(1) and (3) UNCLOS obligations to negotiate in good faith and to make every effort through provisional arrangements not to jeopardise or hamper arrival at an agreement.

In its judgment, the Special Chamber reached a number of conclusions which, taken with its Order for the prescription of provisional measures of 25 April 2015, will have significant, practical implications for the future conduct of unilateral oil and gas activities in disputed maritime areas, as well as for the associated rights and obligations incumbent upon States concerned. Read the rest of this entry…