International Court of Justice — Jurisdiction — Unilateral application — American Treaty on Pacific Settlement, 1948 (“Pact of Bogotá”)

Treaties — Binding international agreements — Role of unilateral proclamations in establishing existence of an agreed boundary — Whether 1952 Santiago Declaration establishing boundary between Chile and Peru — Treaty interpretation — Vienna Convention on the Law of Treaties, 1969 — Articles 31 and 32 — Whether tacit agreement existing between Chile and Peru on their maritime boundary — Role of subsequent treaties in ascertaining tacit agreement — Whether 1954 Special Maritime Frontier Zone Agreement acknowledging existence of tacitly agreed boundary — Whether lighthouse arrangements confirming existence of agreed boundary — Extent of tacitly agreed boundary — Whether fishing and enforcement activities indicating extent of tacitly agreed boundary — Whether developments in law of the sea indicating extent of tacitly agreed boundary — Whether Bákula Memorandum indicating extent of tacitly agreed boundary — Starting point of tacitly agreed boundary — 1929 Treaty of Lima — Whether 1930 Mixed Commission determining starting point of maritime boundary — Whether starting point of maritime boundary coinciding with end point of land boundary

Sea — United Nations Convention on the Law of the Sea, 1982 — Articles 74 and 83 — Customary international law — Maritime boundary delimitation — Single maritime boundary — All-purpose maritime boundary — Territorial sea — Exclusive economic zone — Continental shelf — Three-stage approach — Equidistance — Relevant circumstances — Proportionality — Relevant coast — Relevant area — Tracé parallèle — Arcs of circle — Whether Peru having sovereign rights and jurisdiction in area beyond 200 nautical miles from Chile’s coast but within 200 nautical miles of Peru’s coast