At present, the Sibe language is the only still-active oral variety of Manchu, the language of the indigenous tribe of Manchuria. With some 20,000 to 30,000 speakers it is also the most widely spoken of the Tungusic languages, which are found in both Manchuria and eastern Siberia. In the 1990s, when the oral varieties of Manchu either became extinct or were on the verge of extinction, Sibe survived as a language spoken by all generations of Sibe people in the Chapchal Sibe autonomous county, and by the middle and older generations in virtually all other Sibe settlements of Xinjiang. "Spoken Sibe" is a carefully researched study of this historically and linguistically important language.