Answer:
All three of these empires are located in a general area. Or more specifically, on and near the Niger River in the Sahara desert. Some Arabs in their trad made tales about how they were the richest empire in gold. They thought this was because of the Niger River and It's water. The people of Ghana, Mali, and Songhai also used the Niger River for trade and they would tax each other then coming into their empires and make them play extra for lodging.
Explanation:
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