Lake Victoria, in East Africa, is the world's largest tropical freshwater lake. At 68,800km², it's also the second largest freshwater lake in the world after Lake Superior in North America. On a clear day you cannot see the other side of Lake Victoria, yet this vast body of water has dried up several times in the past - and it could happen again.
Over the past 100,000 years, the lake has completely dried up at least three times. Each time it was probably replaced by a vast grassland.
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