Diffa is a city and Urban Commune in the extreme southeast of Niger, near the border with Nigeria.

[5][6][7] In recent years, refugees from Nigeria fleeing violence from Boko Haram have settled in Diffa and surrounding area.

[2] Much of the riverbank is lined with gardens and small allotments which grow the town's well-known red peppers.

Maïné-Soroa, the other major town of the Region, lies less than 100 km to the west of Diffa.

The border with Nigeria, at the Nigerian town of Duji, is 5.5 km to the south of Diffa.