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III Points of Substantive Law, Division B: State Sovereignty, Territory And Frontiers, Ch.III: Land Frontiers

From: The Law and Procedure of the International Court of Justice: Fifty Years of Jurisprudence Volume II

Hugh Thirlway

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 23 September 2023

International courts and tribunals, decisions — Boundaries — Maritime boundaries — Erga omnes obligations
It is long established in legal theory that an international frontier divides the spatial extent of adjacent States ab inferis ad coelum, that is to say not merely on the earth’s surface but below it, and above it so as to divide the airspace.222 The Chamber of the Court seised of the Frontier Dispute between Benin and Niger had occasion to apply this principle in unusual circumstances, in order to determine sovereignty over jointly-owned bridges crossing a river that constituted an international boundary (see Section 4 below). As the Permanent Court recalled in...
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