Chalcha
The Khalkha dialect (Mongolian script: , "", Mongolian Cyrillic: , ) is a dialect of central Mongolic widely spoken in Mongolia. According to some classifications, the Khalkha dialect includes Southern Mongolian varieties such as "Shiliin gol", "Ulaanchab" and "Sönid". As it was the basis for the Cyrillic orthography of Mongolian, it is de facto the national language of Mongolia. The name of the dialect is related to the name of the Khalkha Mongols and the Khalkha river.