Finland–Sweden border border continues south into the northern Baltic Sea to a point where it meets the zone border of Estonia. The tripoint between the economic zones is defined by a treaty signed in 2001. The Finnish–Swedish border was created in 1809 by the Treaty of Fredrikshamn, as Sweden ceded Finland over to Russia. The course of the border was described in the fifth article of the treaty, without great detail. The borders were agreed to be the Sea of Åland, the Gulf of Bothnia, and the rivers Tornionjoki and Muonionjoki. Islands in the sea belonged to whichever country was the nearest
Germany–Poland border at the Yalta Conference and Potsdam Conference. This border was a compensation to Poland for territories lost to the Soviet Union as a consequence of the Molotov–Ribbentrop Pact, and resulted in significant westward transfers of German population from the Recovered Territories, matching the Polish population transfers from the Kresy territories. It roughly matched the centuries-old, historical border between the Medieval Polish and German states. It divided several river cities into two parts – Görlitz/Zgorzelec, Guben/Gubin, Frankfurt (Oder)/Słubice, Bad Muskau/Łęknica. The border was recognized by East Germany in the Treaty of Zgorzelec in 1950, by West Germany in 1970 in the