Giant ‘Gullies’ in the Earth Threaten Cities in Africa amid Rapid Urbanization

image via New Scientist

August 31, 2025, 11:00 AM

• •Giant gullies are expanding in African cities, swallowing homes and displacing thousands.
• •Gullies are caused by a combination of natural and human factors, including inadequate drainage.
• •Hundreds of thousands of people across Africa are likely to be displaced within the next 10 years.
• •Preventing gully formation is more effective and affordable than stabilizing them after they form.

A study has found that giant gullies are opening up in African cities, swallowing homes, businesses, and sometimes resulting in deaths. These gullies are caused by a combination of natural and human factors, particularly inadequate drainage systems in urban areas built on sandy soils. Researchers estimate that hundreds of thousands of people across Africa are likely to be displaced within the next 10 years if urgent action isn't taken. Preventing gully formation through sustainable infrastructure is more effective and affordable than trying to stabilize them after they form.

Read original article