PALAEOLAKE MEGA CHAD
In 4000 BCE, a lake Mega Chad larger than all five Great Lakes covered roughly 360,000 sq km of what is now the Sahara. 6,000 years later, only a tiny fraction, well under 1%, of that ancient lake remains
A dried lakebed in Africa's Chad sends 27.7 million tonnes of dust across 5,000 km of Atlantic Ocean each year, carrying phosphorus that helps sustain the Amazon rainforest
Sahara contained the world's largest lake
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