Near Omar Gona's house in Djibouti's Tadjourah city stands a wall three metres high and five metres thick. What might be an eyesore for some is a godsend for the city because the wall holds back the monsoon rains that have decimated people's lives here for decades.
"In 1994, my family home was washed away by a big flood," says Gona. "Since then, my family have always lived in fear of flooding and in the rainy seasons, we sometimes flee to the mountains leaving all our property here for days."
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