The France–Tonga Maritime Delimitation Convention is a 1980 treaty in which France and Tonga agreed to a maritime border between Tonga and the French territory of Wallis and Futuna.
The text of the treaty is brief and states that the boundary will be an equidistant line between the Tongan and the French islands and that as soon as possible the parties will draw up cartographic maps that illustrate the border.
When the border was actually drawn, Tongan sovereignty over Niuafo'ou was considered in drawing the equidistant line even though Niuafo'ou is hundreds of kilometres north of the rest of the islands of Tonga.
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