47,549 km2 (18,359 sq mi) were defined according to the Treaty of Tartu in 1920 between Estonia and Russia. Today, the remaining 2,323 km2 (897 sq mi) are part of Russia. The ceded areas include most of the former Petseri County and areas behind the Narva river including Ivangorod (Jaanilinn).Pechory remains under Russian administration.
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In the Estonian language, the oldest known endonym of the Estonians was maarahvas, meaning "country people" or "people of the soil". The land inhabited by Estonians was called Maavald meaning "Country Realm" or "Land Realm".
One hypothesis regarding the modern name of Estonia is that it originated from the Aesti, a people described by the Roman historian Tacitus in his Germania (ca. 98 AD). The historic Aesti were allegedly Baltic people, whereas the modern Estonians are Finno-Ugric. The geographical areas between Aesti and Estonia do not match, with Aesti being farther south.
Ancient Scandinavian sagas refer to a land called Eistland, as the country is still called in Icelandic, and close to the Danish, German, Dutch, Swedish and Norwegian term Estland for the country. Early Latin and other ancient versions of the name are Estia and Hestia.
Esthonia was a common alternative English spelling before 1921; the country was admitted to the League of Nations under this name, and it continued in the international organization's records until December 1926.