Southern Altai (also known as Oirot, Oyrot, Altai and Altai proper) is a Turkic language spoken in the Altai Republic, a federal subject of Russia located in Southern Siberia on the border with Mongolia and China. The language has some mutual intelligibility with the Northern Altai language, leading to the two being traditionally considered as a single language. According to modern classifications—at least since the middle of the 20th century—they are considered to be two separate languages.