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
Postage stamps and postal history of Latvia Postal Service routes in Finland. In 1685 the Duke of Courland Friedrich Casimir initiated his own postal service and asked the Swedish authorities to cease their postal operations within his territory, but King Charles XI of Sweden ignored his request and stood for his rights in Courland. On 5 July 1710, Russian troops under the command of Tsar Peter I of Russia took over Riga and made it a part of the Russian Empire. During World War I, Latvia was occupied by Germany, and used German stamps overprinted by the Ober Ost. In 1919, German stamps were handstamped "LIBAU", but