Unreliable access to food due to a decades-old conflict, low food production, and corruption have pushed more than six million Somalis to the brink of starvation as the war-torn country heads towards famine.
The world only has a "window of three to four months" to save millions in the two countries, according to the humanitarian organisation.
World body calls on rich countries to do more, as it presses the need for $4.4 billion in emergency aid to respond to the "world's largest humanitarian crisis since 1945" in Yemen, Somalia, South Sudan and Nigeria.
UNICEF in February warned the drought in Somalia could lead to up to 270,000 children suffering from acute malnutrition this year.
The donor countries are meeting at the Humanitarian Conference in Oslo to raise aid for millions of people threatened by famine in Nigeria and Lake Chad region.
UN chief says armed conflicts are having devastating humanitarian consequences.
About 100,000 people face immediate starvation, with millions more on the brink of famine. The UN warns that nearly half of South Sudan's population will be without food by July if no action is taken.
Three years of drought have destroyed food and seed stock in the region. The UN warns a third of a million people are at severe risk.
Plagued by drought, famine, terrorist attacks and political shocks, the continent has faced many challenges in 2016.
Interim president Jocelerme Privert warns his country could face food scarcity within three months as crops and reserves have been destroyed. Meanwhile, an ongoing cholera outbreak spirals out of control after the storm contaminated water sources.
About 65,000 people are affected according to the latest food security assessment. Staff from an aid agency had counted the graves of 430 children who had died of hunger over the past few weeks in Nigeria.
The risk to people affected by hunger in Somalia increases amid worsening climate change and an ongoing civil conflict between the militant group Al Shabaab and the government.
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