Estonia /?s'to?ni?/ (help·info) (Estonian: Eesti), officially the Republic of Estonia (Estonian: Eesti Vabariik), is a country in Northern Europe. It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Latvia (343 km), and to the east by the Russian Federation (338.6 km). The territory of Estonia covers 45,227 km2 (17,462 sq mi) and is influenced by a temperate seasonal climate.

The Estonians are a Finnic people, with the Estonian language exhibiting many similarities to Finnish. The modern name of Estonia is thought to originate from the Roman historian Tacitus, who in his book Germania (ca. 98 CE) described a people called the Aestii. Similarly, ancient Scandinavian sagas refer to a land called Eistland, 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 alternate English spelling prior to independence.

Estonia is a democratic parliamentary republic and is divided into fifteen counties. The capital and largest city is Tallinn. With a population of only 1.33 million, Estonia is one of the least-populous members of the European Union. Estonia was a member of the League of Nations from 22 September 1921, has been a member of the United Nations since 17 September 1991, of the European Union since 1 May 2004 and of NATO since 29 March 2004. Estonia has also signed the Kyoto protocol.