From these facts, the court concluded that Thailand had accepted the Annex I map. Even if there were any doubt in this connection, Thailand was not precluded from asserting that she had not accepted it since France and Cambodia had relied upon her acceptance and she had for fifty years enjoyed such benefits as the Treaty of 1904 has conferred on her. Furthermore, the acceptance of the Annex I map caused it to enter the treaty settlement; the Parties had at that time adopted an interpretation of that settlement which caused the map line to prevail over the provisions of the Treaty and, as there was no reason to think that the Parties had attached any special importance to the line of the watershed as such, as compared with the overriding importance of a final regulation of their own frontiers, the Court considered that the interpretation to be given now would be the same.
The Court therefore felt bound to pronounce in favour of the frontier indicated on the Annex I map in the disputed area and it became unnecessary to consider whether the line as mapped did in fact correspond to the true watershed line.
For these reasons, the Court upheld the submissions of Cambodia concerning sovereignty over Preah Vihear.