Kavir
Kavir is an Indo-European language spoken in Iran. Glottolog rates it moribund.
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Kavir, or ambiguously Biyabanaki, is a group of Western Iranian languages spoken in the Kavir valley in central Iran.
The Kavir languages are Farvi (~500 speakers), Garma'i (10 speakers), Khuri, and Iraji (6 speakers).
From Wikipedia · Kavir languages · CC BY-SA 4.0