International Court of Justice — Jurisdiction — Admissibility — American Treaty on Pacific Settlement, 1948 (Pact of Bogotá) — Declarations of acceptance of compulsory jurisdiction — Res judicata — Joinder of proceedings — Expert opinion

Territory — Admissibility of Nicaragua’s claim — Res judicata — Whether International Court of Justice (“ICJ”) having determined Costa Rica’s sovereignty over the coast of Isla Portillos in judgment of 16 December 2015 — Starting point of land boundary — Cleveland Award, 1888 and Alexander Award, 1897 — Assessment of the ICJ-appointed experts — Whether water channel connecting Harbor Head Lagoon to San Juan River — State responsibility — Whether Nicaragua violating Costa Rica’s sovereignty by placing a military camp on Costa Rica’s territory — Whether Nicaragua violating 2015 judgment by placing a military camp on Costa Rica’s territory — Whether Nicaragua obliged to remove military camp

Sea — United Nations Convention on the Law of the Sea, 1982 — Articles 15, 74 and 83 — Maritime delimitation — Starting point — Fixed point — Territorial sea — Provisional median line — Special circumstances — Whether convexity and concavity at Punta de Castilla justifying adjusting provisional median line — Whether configuration of coast in vicinity of Salinas Bay justifying adjusting provisional median line — Exclusive Economic Zone — Continental shelf — Three-stage approach — Relevant coast — Relevant area — Radial projections — Frontal projections — Provisional equidistance line — Whether Corn Islands, Paxaro Bovo and Palmenta Cays appropriate base points — Relevant circumstances — Whether three-State concavity inequitably cutting off Costa Rica’s coastal projections — Whether Corn Islands to be given no effect — Whether convexity and concavity around Punta de Castilla justifying adjusting provisional equidistance line — Whether Santa Elena Peninsula and Nicoya Peninsula to be given half effect — Disproportionality test — Simplified maritime boundary