The UN Atlas of Endangered Languages lists 18 languages with only one remaining speaker. With about one language disappearing every two weeks, some of these have probably already died off.
The following 18 languages were last known to have one remaining speaker. They are the most at-risk languages on a list of 199 classified in the United Nations Atlas of Endangered Languages as critically endangered, meaning they have fewer than 10 documented speakers.
Regions with the most linguistic diversity also tend to have the most endangered languages.
1. Apiaka is spoken by the indigenous people of the same name who live in the northern state of Mato Grosso in Brazil. The critically endangered language belongs to the Tupi language family. As of 2007, there was one remaining speaker.
2. Bikya is spoken in the North-West Region of Cameroon, in western Africa. The last record of a speaker was in 1986, meaning the language could now be extinct. This predicament resembles that of another Cameroon language, Bishuo, whose last recorded speaker was also in 1986.
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