The Harmon Doctrine, or the doctrine of absolute territorial sovereignty, holds that a country has absolute sovereignty over the territory and resources within its borders.
Background The doctrine is named after U.S. Attorney General Judson Harmon, who made a comment during the Chamizal dispute, a dispute between USA and Mexico over the Rio Grande in 1895, in reference to international watercourses —
References Stephen C. McCaffrey (1996). The Harmon Doctrine One Hundred Years Later: Buried, Not Praised, 36 Nat. Resources J. 965.
Rahaman, M.M. (2009) 'Principles of international water law: creating effective transboundary water resources management', Int. J. Sustainable Society, Vol. 1, No. 3, pp.207–223.
Further reading What does international law say about water allocation? United Nations Economic Commission for Europe