The north-east Nigerian city of Maiduguri has more than doubled in size due to displacement caused by the extremist Boko Haram group.
And the UN’s most senior envoy on the Sahel region, Toby Lanzer, says that’s putting its services under immense pressure, with no one clear on when it will be safe to go home.
The plight of the internally displaced is just one of the issues that are getting worse, as the conflict being driven by the terrorist group continues.
More than four million people are in need of food aid and all the countries bordering northern Nigeria are being destabilized, said Mr Lanzer.
He spoke to Cristina Silviero.