evidence: The Netherlands and Germany have not yet agreed on the boundary of the territorial sea near the Ems estuary. Yet, there is a treaty with agreements on cooperation: the Ems-Dollard Treaty. A supplementary agreement has been added to this treaty. It only deals with the exploration and exploitation of oil and gas. The borders of the treaty and the Supplementary Agreement do not match. The maritime border is disputed in a part of the Ems estuary outside the Dollart bay, where Germany has the view that the state border runs on the left bank of the Ems, while the Netherlands regards the Thalweg as its border. This is based on interpretations of old treaties. Germany relies on a bill of enfeoffment from 1464, when German Emperor Frederick III raised Ulrich I, the son of a local chieftain to the status of Imperial Count, in which the County of East Frisia [...] There is no maritime boundary between The Netherlands (Western islands) and Germany (Eastern islands) to delimit the Territorial Sea. The current 3M limit and the current 12 M limit are shown. The Eems-Dollard (ED) treaty of 1960 is limited to the intersection of the 6 m depth line and the outer limit of the territorial sea, at that moment 3 M from the baseline. The Supplementary Agreement to the Eems-Dollard treaty is limited to the 3 M limit in 1962.