what is the meaning of Thalweg Line

The thalweg line is a concept of river law, defined under customary law either as “the mid-line of the main navigation channel” or as the deepest water line. The purpose of the thalweg line in matters of delimitation is to ensure an equal share of the navigable channel between two sovereign States taking into account the navigation interests. As compared to the median-line, the thalweg line as single rule was less used for maritime delimitation in State practice; one example is the Alaska Boundary Arbitration between Great Britain and the United States in 1903.

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