Why is Kanuri considered a lingua franca?

Kanuri is considered a trade language, or lingua franca, primarily due to its role in facilitating commerce across the region. Specifically, the Manga Kanuri dialect is utilized as a trade language by hundreds of thousands of people across Niger and Nigeria.1

The Kanuri people have a long history as a commercial society with well-developed internal trade networks. Historically, they established a powerful state at the Sudanese terminus of major trans-Saharan trade routes, which connected the region to broader markets through the Bilma oasis. This commercial heritage, combined with the widespread use of the Yerwa Kanuri dialect for communication across Cameroon, Chad, Niger, Nigeria, and Sudan, reinforces the language's status as a vital tool for regional interaction.21