The maritime boundary between Norway and Sweden was originally formulated by virtue of an agreement dating from 1661. It defined a maritime frontier extending from the land boundary terminus in the Iddefjord and continuing seaward into the Svinesund, before ending in the Skagerrak, a straight that connects the North Sea and the Baltic Sea. The location of the 1661 territorial sea boundary was clarified by the work of an 1897 boundary commission and a 1909 tribunal. The continental shelf boundary was later delimited by an agreement reached in 1968, which used a simplified equidistance line plotted from the straight baselines of the two States. The continental shelf boundary terminated at a tripoint that was equidistant from Denmark, Norway, and Sweden. The current day boundary is 80 nautical miles in length. 

Map showing the maritime boundary between Norway and Sweden

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