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Estonian, the country's official language, is most closely related to this language.
What is Finnish?
The official language, Estonian, belongs to the Finnic branch of the Uralic languages. Estonian is closely related to Finnish, spoken on the other side of the Gulf of Finland, and is one of the few languages of Europe that is not of an Indo-European origin. Despite some overlaps in the vocabulary due to borrowings, in terms of its origin, Estonian and Finnish are not related to their nearest geographical neighbours, Swedish, Latvian, and Russian, which are all Indo-European languages.