Where was the Cuitlatec language spoken before it became extinct?

The Cuitlatec language was primarily spoken in the Mexican state of Guerrero. Some sources also associate the Cuitlatec people with the neighboring state of Michoacán, though the language is most specifically identified with its historical presence in Guerrero.12

The language, which is considered a language isolate, became extinct in the 1960s following the death of its last known speaker, Juana Can.1