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Case name Arbitration Between the Republic of Croatia and the Republic of Slovenia
Case description

On 4 November 2009, the Prime Ministers of Croatia and Slovenia signed an Arbitration Agreement, by which Croatia and Slovenia submitted their territorial and maritime dispute to arbitration. The Arbitration Agreement was subsequently ratified by Croatia and Slovenia in accordance with their respective constitutional procedures.

Article 3 of the Arbitration Agreement tasks the Arbitral Tribunal to determine (a) “the course of the maritime and land boundary between the Republic of Slovenia and the Republic of Croatia”; (b) “Slovenia’s junction to the High Sea”; and (c) “the regime for the use of the relevant maritime areas.”

Article 4 of the Arbitration Agreement mandates that the Tribunal apply (a) “the rules and principles of international law” for the determinations in respect of the course of the maritime and land boundary, and (b) “international law, equity and the principle of good neighbourly relations in order to achieve a fair and just result by taking into account all relevant circumstances” for the determinations in respect of “Slovenia’s junction to the High Sea” and the regime for the use of the relevant maritime areas.


Following a first procedural meeting on 13 April 2012, Croatia and Slovenia exchanged three rounds of extensive written submissions, which were accompanied by over two thousand documentary exhibits and maps. From 2 to 13 June 2014, a hearing was held at the Peace Palace, in the course of which both Parties presented their positions.


On 29 June 2017, the Tribunal rendered a Final Award at a public sitting at the Peace Palace, The Hague.


The Permanent Court of Arbitration acted as Registry in this arbitration.

Name(s) of Claimant(s)
Name(s) of Respondent(s)
Names of Parties The Republic of Croatia ( State )
The Republic of Slovenia ( State )
Case number 2012-04
Administering institution Permanent Court of Arbitration (PCA)
Case status Concluded
Type of case Inter-state arbitration
Subject matter or economic sector Border delimitation
Rules used in arbitral proceedings Permanent Court of Arbitration Optional Rules for Arbitrating Disputes between Two States
Treaty or contract under which proceedings were commenced Bilateral treaty
Arbitration Agreement
Country A: Croatia
Country B: Slovenia

Language of Proceeding English
Seat of Arbitration (by Country) Belgium

Judge Gilbert Guillaume 
Professor Vaughan Lowe QC 
Judge Bruno Simma 
Ambassador Rolf Einar Fife (since 25 September 2015)
Professor Nicolas Michel (since 25 September 2015)

Judge Ronny Abraham (until 3 August 2015)

Professor Budislav Vukas (until 30 July 2015)

Dr. Jernej Sekolec (until 23 July 2015)

Representatives of the Claimant(s)
Representatives of the Respondent(s)
Representatives of the Parties



Professor Maja Seršić, Head of the Department of International Law, University of Zagreb, Faculty of Law
(until 31 July 2015)


H.E. Ms. Andreja Metelko-Zgombić, Ambassador, Director-General, Directorate for European Law, International Law and Consular Affairs, Ministry of Foreign and European Affairs
(until 31 July 2015)
Counsel and Advocates     

Professor Zachary Douglas, Matrix Chambers (until 31 July 2015)
Mr. Paul Reichler, Foley Hoag LLP (until 31 July 2015)
Professor Philippe Sands QC, Matrix Chambers (until 31 July 2015)
Ms. Anjolie Singh (until 31 July 2015)
Professor Davor Vidas (until 31 July 2015)




Professor Mirjam Škrk, Head of the Chair of International Law, Faculty of Law, University of Ljubljana

H.E. Ms. Simona Drenik, Minister Plenipotentiary, Legal Advisor, Cabinet of the Minister, Ministry of Foreign Affairs (until 23 July 2015)



H.E. Ms. Nataša Šebenik, Minister Plenipotentiary, Ministry of Foreign Affairs (as of 7 March 2016)

Counsel and Advocates     

Mr. Rodman R. Bundy, Eversheds LLP
Dr. Daniel Müller
Professor Alain Pellet
Sir Michael Wood, 20 Essex Street
Assistants to Counsel

Ms. Natasha Harrington, Eversheds LLP
Dr. Maja Menard
Ms. Alina Miron
Mr. Eran Sthoeger

Number of Arbitrators in case 5
Date of commencement of proceeding [dd-mm-yyyy] 2012
Date of issue of final award [dd-mm-yyyy] 29-06-2017  
Length of Proceedings More than 4 years
Additional notes
Attachments Award or other decision
30-06-2016  English
29-06-2017  English

Press Release
18-11-2013  French
18-11-2013  English
18-02-2013  English
18-02-2013  French
13-04-2012  English
29-05-2014  English
29-05-2014  French
17-06-2014  English
10-07-2015  English
10-07-2015  French
23-07-2015  English
23-07-2015  French
28-07-2015  French
28-07-2015  English
30-07-2015  English
30-07-2015  French
05-08-2015  English
05-08-2015  French
19-08-2015  English
19-08-2015  French
25-09-2015  English
25-09-2015  French
02-12-2015  English
02-12-2015  French
14-03-2016  English
18-03-2016  English
18-03-2016  French
30-06-2016  English
30-06-2016  French
26-04-2017  English
26-04-2017  French
19-06-2017  English
19-06-2017  French
29-06-2017  English
29-06-2017  French
29-06-2017  English

05-05-2015  English
19-06-2017  English
04-11-2009  English
29-06-2017  English
29-06-2017  English

17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-06-2014  English
17-03-2016  English
17-03-2016  English
17-03-2016  English
29-06-2017  N/A
29-06-2017  N/A
29-06-2017  N/A
29-06-2017  N/A
29-06-2017  N/A

29-06-2017  English
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