The International Court of Justice (ICJ), after six years of proceedings commencing in 2016, rendered its judgment in the case concerning the Dispute over the Status and Use of the Waters of the Silala (Chile v. Bolivia). Rather than issuing a decisive ruling on the substantive legal questions presented, the Court adopted a conciliatory approach, emphasizing areas of agreement between the parties and promoting cooperative solutions. Consequently, the Court refrained from ruling on most of the legal issues put before it. Regarding the Silala River dispute, the Court had both the opportunity and obligation to adjudicate issues concerning "current use" and "vested rights" within the framework of the fundamental equitable and reasonable utilization principle and the obligation of prior notification and consultation concerning planned measures. This study examines whether the ICJ's judgment can foster meaningful transboundary water cooperation. The hypothesis posits that the Court's decision not only fails to assist states in fulfilling their cooperative obligations under international water law but may even undermine such cooperation. Through a doctrinal and analytical methodology, this study concludes that the ICJ failed to adequately resolve fundamental legal issues or provide sufficient jurisprudential guidance to the parties regarding their rights and obligations under international water law.
Agreement on the Nile River Basin Cooperative Framework art. 3(1) (general principles-cooperation), art.7.
Application Instituting Proceedings, filed in the Registry of the Court on 6 June 2016, Dispute over Status and Use of Waters of Silala (Chile v. Bol.), 1-17. https://perma.cc/5ZKM-5G8X
Ass’n Rep. of the Sixtieth Conf., Rules on the Water Pollution in an International Drainage Basin, 535, art. 4 (1982)
Brunnée, Jutta. Procedure and Substance in International Environmental Law. Leiden: Brill/Nijhoff, 2020.
Certain Activities Carried Out by Nicaragua in Border Area (Costa Rica v. Nicar.)
Convention on the Law of the Non-navigational Uses of International Watercourses. adopted 21 May 1997, entered into force 17 August 2014.
Convention on the Protection and Use of Transboundary Watercourses and International Lakes, opened for signature Mar. 17, 1992, 1936 U.N.T.S. 269.
Delimitation of Maritime Boundary in Gulf of Maine Area (Can./U.S.), Judgment, 1984 I.C.J. 246, 111 (Oct. 12).
Dispute Over Status and Use of Waters of Silala (Chile v. Bol.), Judgment, 2022 I.C.J. 5 (Dec. 1)
Diversion of Water from Meuse (Neth. v. Belg.), Judgment, 1937 P.C.I.J. (ser. A/B) No. 70 (June 28)
Draft Articles on the Law of the Non-Navigational Uses of International Watercourses, [1994]
Draft Articles on the Law of Transboundary Aquifers, [2008] 2 Y.B. Int’l L. Comm’n, 19, 20, U.N. Doc. A/CN.4/SER.A./2008/Add.1.
Fabri, Hèléne Ruiz. “Dispute Resolution in the Law of International Watercourses and the Law of the Sea”, in: A Bridge over Troubled Waters. Leiden; Boston: Brill Nijhoff, 2020.
Franckx, Erik & Marco Benatar. “The “Duty” to Co-Operate for States Bordering Enclosed or Semi-Enclosed Seas”, in: Chinese (Taiwan) Yearbook International Law & Affairs, 31(2013), 66-81. https://doi.org/10.1163/9789004306509_003
Hakimi, Monica. “Making Sense of Customary International Law”. Michigan Law Review, 118, 8(2020), 1487-1537. https://doi.org/10.36644/mlr.118.8.making
Helal, Mohammed S. “Sharing Blue Gold: The 1997 UN Convention on the Law of the Non-Navigational Uses Of International Watercourses Ten Years On”. Colorado Environmental Law Journal, 18, 2(2007), 337-378. Available at: https://scholar.law.colorado.edu/celj/vol18/iss2/3
Joined with Construction of Road in Costa Rica Along San Juan River (Nicar. v.Costa Rica) Judgment, 2015 I.C.J. 665 (Dec.16)
Leb, Christina. “One Step at a Time: International Law and the Duty to Cooperate in the Management of Shared Water Resources”. Water International, 40, 1(2015), 21-32. https://doi.org/10.1080/02508060.2014.978972
Leb, Christina. Cooperation in the Law of Transboundary Water Resources. Cambridge: Cambridge University Press, 2013.
McCaffrey, Stephen C. The Law of International Watercourses. 3rd Edition. Oxford International Law Library ,2019. online edn, Oxford Academic. https://doi.org/10.1093/law/9780198736929.001.0001
McIntyre, Owen. “The World Court's Ongoing Contribution to International Water Law: The Pulp Mills Case between Argentina and Uruguay”. Water Alternatives, 4, 2(2011), 124-144.
Meshel, Tamar M. “Unmasking the Substance Behind the Process: Why the Duty to Cooperate in International Water Law is Really a Substantive Principle”. Denver Journal of International Law & Policy, 47, 1(2018), 29-49.
Mulligan, B.M. & Gabriel Eckstein. “The Silala/Siloli Watershed: Dispute over the Most Vulnerable Basin in South America”. International Journal of Water Resources Development, 27, 3(2011), 596-606. 10.1080/07900627.2011.595363
Pulp Mills on River Uruguay (Arg. v. Uru.), Judgment, 2010 I.C.J. 14 (Apr. 20)
Rahaman, Muhammad Mizanur. “Principles of International Water Law: Creating Effective Transboundary Water Resources Management”. International Journal of Sustainable Society, 1, 3(2009), 207-233. DOI:10.1504/IJSSOC.2009.027620
Rejoinder of the Plurinational State of Bolivia, Dispute Over Status and Use of Waters of Silala (Chile v. Bol.) 70 (May 15, 2019), https://perma.cc/7D65-XGQ3.
of ILC of the Seventy-First Conf., The Berlin Rules on Water Resources, 337, art. 11 (2004).
of the IlC of the Fifty-Second Conf., Helsinki Rules on the Uses of Water of International Rivers, 484, art. XXIX (Aug. 1966).
Report of the Internatioanl Law Commission on the Work of Its Seventy-First Session, U.N. Doc. A/74/10 at 279 (2019).
Rieu-Clarke, Alistair, Ruby Moynihan & Bjørn-Oliver Magsig. UN Watercourses Convention: User’s Guide. United Kingdom: IHP-HELP Centre for Water Law, 2012.
Rossi, Christopher R. “The Transboundary Dispute over the Waters of the Silala/Siloli: Legal Vandalism and Goffmanian Metaphor”. Stanford Journal of International Law, 53, 1(2017), 55-87.
Rubenstein, William B. “Why Enable Litigation?: A Positive Externalities Teory of the Small Claims Class Action”. University of Missouri-Kansas City Law Review, 74, 6(2006), 1-22.
Separate Opinion of judge Ad Hoc Simma (n 9) para 15; Chile v. Bol, 2022 I.C.J.
Shafiei Bafti, Negin and Shima Soleimani. "The Relationship Between the Principle of Reasonable and Equitable Utilization and the Principle of No-Harm in International Law of Watercourses with Emphasis on the 1997 Convention." Public Law Studies, 51, 4, (2021), 1579-1601. https://doi.org/10.22059/jplsq.2021.319646.2708 (in Persian)
Silala (n 1) Declaration of Judge Charlesworth. Para 22; Chile v. Bol, 2022 I.C.J.
Tanzi, Attila M. “Chapter 12 Substantialising the Procedural Obligations of International Water Law between Compensatory and Distributive Justice”. in: A Bridge over Troubled Waters. Leiden; Boston: Brill Nijhoff, 2020, 351-374. https://doi.org/10.1163/9789004434950_014
Tanzi, Attila M. “The Inter-Relationship between No Harm, Equitable and Reasonable Utilisation and Cooperation Under International Water Law”, International Environmental Agreements: Politics, Law and Economics, 20, (2020), 619- 620. https://doi.org/10.1007/s10784-020-09502-7
Territorial Jurisdiction of the International Commission of River Oder, Judgment No. 16, 1929, P.C.I.J., (ser. A) No. 23, at 27 (citing Gabčíkovo- Nagymaros Project (Hung./Slovk.), Judgment, 1997 I.C.J. 7, 85 (Sept. 25)).
The Pollution of Rivers and Lakes and International Law, 58 Annuaire de l’Institut de Droit International 104, art. VII (1979).
van den Berg, Stephanie. “World Court Urges Chile and Bolivia to cooperate on Silala river”. Reuters, 2022. Available at: https://www.reuters.com/world/europe/world-court-urges-chile-bolivia-cooperate-silala-river-2022-12-01/
Wouters, Patricia & A. Dan Tarlock. “The Third Wave of Normativity in Global Water Law: The Duty to Cooperate in the Peaceful Management of the World's Water Resources: An Emerging Obligation Erga Omnes?”. Journal of Water Law, 23, (2013), 51-65.
Zamani, Seyed Ghasem and Pouya Berelian. "The Concept and Scope of the Principle of Reasonable and Equitable Utilization of Shared Water Resources from the Perspective of International Law." Public Law Research, 24, 75(2022), 9-44. https://doi.org/10.22054/qjpl.2021.59799.2597 (in Persian)
Moradi,A. and Kafaeifar,M. (2025). Review of the ICJ's Judgment in Chile v. Bolivia in Light of International Water Law Principles. Journal of Legal Research, 24(62), 137-174. doi: 10.48300/jlr.2024.443007.2575
MLA
Moradi,A. , and Kafaeifar,M. . "Review of the ICJ's Judgment in Chile v. Bolivia in Light of International Water Law Principles", Journal of Legal Research, 24, 62, 2025, 137-174. doi: 10.48300/jlr.2024.443007.2575
HARVARD
Moradi A., Kafaeifar M. (2025). 'Review of the ICJ's Judgment in Chile v. Bolivia in Light of International Water Law Principles', Journal of Legal Research, 24(62), pp. 137-174. doi: 10.48300/jlr.2024.443007.2575
CHICAGO
A. Moradi and M. Kafaeifar, "Review of the ICJ's Judgment in Chile v. Bolivia in Light of International Water Law Principles," Journal of Legal Research, 24 62 (2025): 137-174, doi: 10.48300/jlr.2024.443007.2575
VANCOUVER
Moradi A., Kafaeifar M. Review of the ICJ's Judgment in Chile v. Bolivia in Light of International Water Law Principles. Journal of Legal Research, 2025; 24(62): 137-174. doi: 10.48300/jlr.2024.443007.2575