Tasawaq (Tuareg name: Tesăwăq), sometimes also called Ingelshi, is a Northern Songhay language spoken by the Issawaghan or Ingalkoyyu, a community surrounding the town of In-Gall in Niger.Michael J. Rueck; Niels Christiansen. Northern Songhay languages in Mali and Niger, a sociolinguistic survey. Summer Institute of Linguistics (1999).Catherine Taine-Cheikh. [Les langues parlées au sud Sahara et au nord Sahel http://hal.archives-ouvertes.fr/halshs-00456346/]. De l'Atlantique à l'Ennedi (Catalogue de l'exposition « Sahara-Sahel »), Centre Culturel Français d'Abidjan (Ed.) (1989) 155–173 A closely related variety called Emghedeshie was spoken in Agadez but is now extinct.
It shares some similarities with Berber languages, e.g. Tamasheq. For example in both languages, the grammatical gender of a noun is female if it begins and ends with the letter t.
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