Among the many language islands produced by the expansion of Songhay out of the middle Niger valley, Korandje stands out for its geographical isolation and linguistic divergence. Confined since perhaps 1200 CE to a single Algerian oasis well over a thousand kilometres from any other Songhay-speaking community, its speakers have extensively reshaped their language and identity under the influence of North African norms, while nevertheless keeping the former clearly distinct. Yet, following the socioeconomic and political changes of the 20th century, the survival of Korandje is now in doubt, as speakers increasingly adopt speech norms and linguistic ideologies negotiated outside the oasis.