Even before the fighting intensified, years of political instability meant Sudan had several million people internally displaced.
The country also hosted 1.13 million refugees from other conflict-ridden countries, including South Sudan, Eritrea and Syria, according to UNHCR data.
Tens of thousands of South Sudanese are flocking home from neighboring Sudan, which erupted in violence last month.
Sam Mednick/APAmid the vast displacement, there have been increasing reports of gender-based violence and domestic violence, especially among internally displaced Sudanese populations, the UN Population Fund said.
This includes 22 attacks on health facilities, six attacks which impacted warehouses, and nine attacks which affected supplies, among others.