《山海经·海经·海外南经》
歧舌国在不死民的东面，那里的人都是舌根在前、舌尖伸向喉部。另一种说法认为歧舌国在不死民的东面。
歧舌国在其东。一曰在不死民东。
The Cross-tongues are to the east of the People of Perpetual Youth, all the people have their tongues rooted at the front and the tip of the tongue facing the throat. Another view is that the Cross-tongues are to the east of the People of Perpetual Youth.