Finland–Sweden border

the northernmost arm of the Baltic Sea

river in northern Sweden and Finland

Kvarken ( (as opposed to South Kvarken); ) is the narrow region of the Gulf of Bothnia separating the Bothnian Bay (the inner part of the gulf) from the Bothnian Sea. The distance from the Swedish mainland to the Finnish mainland is around , while the distance between the outermost islands is only . The water depth in the Kvarken region is only around . The region also has an unusual rate of land rising at almost a year.

Märket ('The Mark', ) is a uninhabited skerry in the Baltic Sea shared by Sweden and Finland (in the area of the autonomous region Åland), with a lighthouse as its salient humanmade feature. Märket has been divided between the two countries since the Treaty of Fredrikshamn of 1809 defined the border between Sweden and Grand Duchy of Finland as going through the middle of the island. The Finnish side of the island is part of the Municipality of Hammarland in the autonomous region of Åland and is the westernmost land point of Finland. The Swedish part of the island is itself divided between two

Muonionjoki (; ; ) is a river in northern Finland and Sweden. It is a tributary of the Tornio. Together the two rivers form the border between Finland and Sweden. The river is 230 kilometres long.

international tripoint between Sweden, Norway and Finland

Kataja is an islet south of Haparanda in Norrbotten. It is the easternmost point of Sweden and it is part of the Haparanda archipelago. The islet has an area of . It is about long and wide.

lake in Enontekiö, Finland, and Kiruna, Sweden

stretch of sea between Finnish Åland and Sweden, forming the passage from the Sea of Åland to the Gulf of Bothnia

Könkämäeno (; ; Meänkieli: Könkämäväylä) is a river in Finland and Sweden in Finnish and Swedish Lapland. It forms the upper course of the Muonionjoki river, which begins where the Könkämäeno river meets the Lätäseno river. The river begins from Lake Kilpisjärvi and forms together with Muonionjoki and the lower course of Torne River the border between Sweden and Finland.

international border between Finland and Sweden

historic photograph depicting the end of World War II in Finland