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Socotra Swahili is an extinct language that was spoken on Socotra Island in Yemen. It was reported to be spoken by a fifth of the island (c. 2,000 people) in 1962.
Freeman-Grenville (1965). The French at Kilwa Island. cited in Ruete; van Donzel (1993). An Arabian Princess Between Two Worlds: Memoirs, Letters Home, Sequels to the Memoirs. p. 172, fn. 48.