The intense Berber-Songhay language contact that produced Northern Songhay cannot be understood adequately without taking into account the existence of a Northern Songhay language outside the Azawagh valley — Korandjé, in Algeria — showing few, if any, signs of Tuareg contact. This article proposes a new explanation based on linguistic, epigraphic, and historical data: Western Berber-speaking Masūfa, present throughout northern Mali around 1200, founded Tabelbala to facilitate a new trade route; they chose Northern Songhay speakers, already a distinct group, for their experience in oasis farming and possibly copper mining. As Masūfa influence waned, the language was reoriented towards North Africa.