The current maritime boundary between Estonia and Finland is a modified equidistance line that extends for 199 nautical miles in the Baltic Sea. It delimits their overlapping entitlements to an exclusive economic zone and continental shelf. Beginning at a de facto tripoint with Russia in the east, the maritime boundary proceeds on a predominately western bearing, through the Gulf of Finland, to an established tripoint with Sweden in the northern Baltic Sea.

The initial maritime boundary between Estonia and Finland was established while Estonia was still part of the Union of Soviet Socialist Republics (USSR). In 1996, following the dissolution of the Soviet Union in 1991, Estonia and Finland re-delimited the entirety of their maritime frontier based on previous boundary agreements. In 2001, the tripoint between Estonia, Finland and Sweden was established, while the eastern tripoint with Russia has yet to be officially recognized.

Estonia and Finland are linked by common cultural, political and strategic interests, and they have also maintained the close economic relations that were in place prior to and after the fall of the Soviet Union. These bonds have continued to strengthen, especially in light of Finland having joined Estonia as one of NATO’s member States.