Most of these endangered languages have Dagestani speakers in the mountainous region on the Dagestan - Georgia border .
Russian became the principal lingua franca in Dagestan during the 20th century ; Over 20 of Russia 's 131 endangered languages as identified by UNESCO can be found in Dagestan .
Most of these endangered languages have Dagestan speakers in the mountainous region on the Dagestan - Georgia border .
Russian became the principal lingua franca in Dagestan during the 20th century ; Over 20 of Russia 's 131 endangered languages as identified by UNESCO can be found in Dagestan .