The Turkic languages may be classified, using linguistic, historical, and geographic criteria, into a southwestern (SW), a northwestern (NW), a southeastern (SE), and a northeastern (NE) branch. Chuvash and Khalaj form separate branches.
The southwestern, or Oghuz, branch comprises three groups. The West Oghuz group (SWw) consists of Turkish (spoken in Turkey, Cyprus, the Balkans, western Europe, and so on); Azerbaijani (Azerbaijanian; Azerbaijan, Iran); and Gagauz (Moldova, Bulgaria, and so on). The East Oghuz group (SWe) consists of Turkmen (Turkmenistan and adjacent countries) and Khorāsān Turkic (northeastern Iran). A southern group (SWs) is formed by Afshar and related dialects in Iran and Afghanistan.