An aerial view of the world's largest refugee camp, Dadaab
Dadaab is currently supporting more than 450,000 people (October 2011), with up to 1,500 more coming in every day.
Actor and Oxfam Ambassador Scarlett Johansson visited Dadaab in September 2011, to shine light on the drought and food crisis that continues to unfold across East Africa.
"Even when you’re there, taking it in with your own eyes, it’s impossible to really take in those figures. Between the tents, people are walking to and from the water stations or simply wandering from tent to tent, hoping to find family, or people from their local communities."
Despite the dangers, thousands of refugees every week are making the journey, walking for weeks across the desert and braving attacks by armed robbers and wild animals.
Read more: East Africa food crisis
Photo: Andy Hall/Oxfam