XX - Ainu
Ainu is a language isolate spoken by the Ainu people in northern Japan, particularly on Hokkaido Island, as well as in some regions of the Russian Far East, such as the Kuril Islands and Sakhalin. The number of fluent speakers has dramatically decreased over the years, with only about 10 native speakers remaining, making Ainu critically endangered. Ainu is unique in that it has no close linguistic relatives, and its vocabulary is rich in terms related to the natural environment, reflecting the Ainu's traditional lifestyle of hunting, fishing, and gathering. Despite its endangered status, there have been revitalization efforts, including language classes and cultural programs, aimed at preserving the Ainu language and heritage for future generations.