The Land Islands, or simply land, are a Finnish archipelago at the mouth of the Gulf of Bothnia in the Baltic Sea. It has been an autonomous and demilitarized zone of Finland since 1920, thanks to a League of Nations resolution, and Swedish is its only official language. It is Finland's smallest district, accounting for 0.51% of the country's land area and 0.54% of its population. Land's capital, Mariehamn, is located in the northwestern part of the nation. Fastaland, where 90% of the population lives, and a further 6,500 skerries and islands to the east make up land. Only 60 of the thousands of islands on the island of Land are populated. A 38-kilometer stretch of open water separates Fastaland from the Swedish coast of Roslagen. The land archipelago is contiguous with the Finnish Archipelago Sea to the east. The uninhabited skerry of Märket, which it shares with Sweden, is Land's only land boundary. A ferry ride from Mariehamn takes about 160 kilometers to Turku, a coastal city on mainland Finland, as well as to Stockholm, Sweden's capital. Because of its autonomous status, land's regional rights, which are usually exercised by members of the central Finnish government, are effectively exercised by its own government. Land's present demilitarized, neutral status dates back to the 1850s, when the Paris Peace Treaty ended the Land War.