Decisions of international courts and arbitrators, as well as judgments of national courts, are fundamental elements of modern public international law. The International Law Reports is the only publication in the world wholly devoted to the regular and systematic reporting in English of such decisions. It is therefore an absolutely essential work of reference. Volume 187 is devoted to the Certain Activities Carried Out by Nicaragua in the Border Area (Costa Rica v. Nicaragua) and the Construction of a Road in Costa Rica along the San Juan River (Nicaragua v. Costa Rica), and Opinion 1/17 (EU-Canada Comprehensive Economic and Trade Agreement [CETA Opinion]).