International donors and member states have pledged more than $2bn in financial assistance for the Lake Chad Basin to address a crisis described as "one of the greatest humanitarian disasters of our age".
Chronic poverty, and food and water shortages, have been compounded by the violent attacks from the Boko Haram group.
Millions of civilians have fled their homes.
The humanitarian pledges came from a high-level conference in the German capital Berlin. The donors hoped to look beyond the immediate crisis to build resilience and stability.
Al Jazeera's Paul Brennan reports from Berlin.
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