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Altaic is a hypothetical language family of central Eurasia and Siberia first proposed in the 18th century, but whose existence is widely discredited among comparative linguists. The Turkic, Mongolic and Tungusic groups are invariably included in the family; some authors added Koreanic and the Japonic languages. The latter expanded grouping came to be known as “Macro-Altaic”, leading to the designation of the smaller former grouping as “Micro-Altaic” by retronymy. Most proponents of Altaic continue to support the inclusion of Korean. These languages are spoken in a wide arc stretching from Eastern Europe through Anatolia and eastern Caucasus through North Asia and Central Asia to the Korean Peninsula and Japanese archipelago in East Asia. The group is named after the Altai mountain range in the center of Asia.