Germany–Poland border former also affected by the Silesian Uprisings). The shape of that border roughly resembled that of pre-partition Poland. After World War II, the border was drawn from Świnoujście (Swinemünde) in the north at the Baltic Sea southward to the Czech Republic (then part of Czechoslovakia) border with Poland and Germany near Zittau. It follows the Oder–Neisse Line of the Oder (Odra) and Neisse (Nysa) rivers through most of their course. This was agreed upon by the main Allies of World War II – USSR, USA and UK, at the Soviets' insistence, and, without any significant consultations with Poland (or Germany),
Finland–Russia border most of which were Savonians. After the Finnish War, the Treaty of Fredrikshamn converted all of Finland from Swedish territory to a Russian possession, the Grand Duchy of Finland. The Finnish–Russian border was moved back to the pre-1721 location, so that the Grand Duchy gained the so-called "Old Finland", territories previously held by Sweden, in 1812. After Finland became independent in 1917, there was the Finnish Civil War in 1918, and even after this war, the Russian Civil War continued. Finnish activists often crossed the border into Soviet territory in order to fight in the "heimosodat", wars aiming at Finnish