More than 6 million people in South Sudan and Haiti are facing food insecurity, United Nations agencies warned this week, including thousands who could soon face catastrophic shortages.

The World Food Programme (WFP) and two other U.N. groups issued the warning for South Sudan on Monday, saying that 4.8 million of the country’s residents are at risk of going hungry. That includes about 40,000 people who the agency warned “are on the brink of catastrophe.”

The WFP issued its own warning for Haiti on Tuesday, saying the El Nino weather pattern fueled a drought that has 3.6 million people facing food insecurity, double the total of six months ago.

In a joint statement, the WFP, Food and Agricultural Organization of the United Nations (FAO), and United Nations Children’s Fund (UNICEF) said the South Sudan situation was “particularly worrisome” because the country is about to enter its lean season, when food is the most scarce.

They warn about 1 in 4 people in South Sudan require urgent assistance.

A recent Integrated Food Security Phase Classification (IPC) analysis, a barometer for measuring food security, found 23 percent of South Sudan is at risk of “acute food and nutrition insecurity” in the first three months of this year. It said the majority of them live in the states of Unity, Jonglei and Upper Nile, where ongoing violent conflicts have forced many from their homes.

The report indicated there was “overwhelming evidence of a humanitarian emergency” in some areas, noting some people were eating water lilies, and warned the situation would likely worsen as water dried up in the coming weeks. The report could not confirm if parts of the country were already experiencing famine, as fighting prevented researchers from accessing certain areas.

The report said the country is also grappling with the effects of a drop in the value of its currency, which sent prices surging. It said the price of Sorghum, a cereal grain, increased 11-fold in a year.

The agencies said it was important they be given the chance to supply aid to those in need.

“Families have been doing everything they can to survive but they are now running out of options,” Jonathan Veitch, the UNICEF representative in South Sudan, said in a statement. “Many of the areas where the needs are greatest are out of reach because of the security situation. It’s crucial that we are given unrestricted access now. If we can reach them, we can help them.”

The WFP is also looking to help Haiti.

According to the organization, the country has seen three straight years of drought and an abnormally strong El Nino weather pattern is threatening to spoil the country’s next harvest.

El Nino occurs when part of the Pacific Ocean is warmer than usual, creating a ripple effect that brings atypical and sometimes extreme weather throughout the world. It’s been blamed for creating heavy flooding in some regions and droughts in others, both of which can spoil harvests.

The WFP said some parts of the country lost 70 percent of last year’s crops, and approximately 1.5 million Haitians are facing severe food insecurity. Others face malnutrition and hunger.