Eastern Gulf of Finland National Park. The National Park includes the outer archipelago of the easternmost coastal municipalities. The hundred islands and islets of the park are scattered onto a large open sea area, which is 60 km wide, and far from the mainland or the inhabited islands. Gulf of Finland National Park is included in the network of the most important protected areas in the Convention on the Protection of the Marine Environment of the Baltic Sea Area. On the Russian side of the border, Gulf of Finland National Park is being planned, which will add to this complex.