AT A GLANCE
Why go?
The Bahr el-Ghazal is a vast, 500-kilometre dry riverbed slicing across central Chad — a geological scar from when the world's largest lake overflowed and carved its escape route toward the desert. Today this wadi is a hard clay highway of emptiness, traversed by nomadic herders and intrepid overland travellers crossing between the Sahel and the high Sahara.↗↗
What makes this landscape extraordinary is its deep-time story: only about 6,000 years ago, the floor of this valley lay beneath the waters of Mega-Chad, a lake larger than the modern Caspian Sea. The Bahr el-Ghazal was that ancient lake's spillway, draining northeast toward what is now the Bodélé Depression — the dustiest place on Earth. Every grain of Saharan dust that fertilises the Amazon rainforest began its journey through this system.↗↗↗
A Valley Carved by a Vanished Sea
The Bahr el-Ghazal — Arabic for "River of the Gazelle" — is a wadi, a dry riverbed that only carries water during rare, extreme rainfall events. When it does flow, it runs from southwest to northeast, away from Lake Chad and toward the Bodélé Depression, some 180 metres lower. Its "sill" marks the lowest point on the drainage divide between the Lake Chad basin and the Bodélé.