South Bolivian Quechua
language

South Bolivian Quechua, also known as Central Bolivian Quechua, is a dialect of Southern Quechua spoken in Bolivia and adjacent areas of Argentina, where it is also known as Colla. It is not to be confused with North Bolivian Quechua, which is spoken on the northern Andean slopes of Bolivia and is phonologically distinct from the South Bolivian variety. Estimates of the number of speakers of South Bolivian Quechua range from 2.3 to 2.8 million, making it the most spoken indigenous language in Bolivia, just slightly greater than Aymara, with roughly 2 million speakers in Bolivia. In comparison, the North Bolivian dialect has roughly 116,000 speakers.
Classification and dialects
South Bolivian Quechua is a member of the Southern branch of the Quechuan languages, making it closely related to other Southern Quechua dialects including Ayacucho and particularly the Cuzco Quechua language, varieties which are both spoken in Peru.
The Quechua language family spans an extremely diverse set of languages, many of which are mutually unintelligible, which is why linguists have classified Quechua as a language family as opposed to one language with many dialects. Though it is believed that all Quechuan languages descended from a single ancestor, Proto-Quechua, there is still debate on how the modern Quechuan languages evolved into their current states, and what this timeline would look like. As a result of this, there have been numerous suggested classifications and theories of the relatedness of specific languages and dialects of Quechua. However, the current broad division of Quechua into four main branches is generally accepted.
There are some dialectal differences in South Bolivian Quechua across the regions of Bolivia.
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