The dispute between Argentina and Uruguay on the Uruguay River is mediated by the King of Spain (Goldstein and Pevehouse, 2014: 258). The mediation was an informal one. Yet, the provisions suggested by the mediator were respected by both parties and the decision of the World Court in the Hague followed these provisions and legalized them. In other words, an informal mediation process led to a formal trial process in the World Court and turned into a formal resolution.