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It's clear from the passage that ...... .
The Zambezi Valley has been inhabited since the
first hunter-gatherers lived there, and Bantuspeaking
Iron-Age farmers have navigated the river
for centuries. Numerous Iron Age sites are scattered
along the Zambezi, including the Ingombe Ilede
burial site near Chirundi, which shows that external
trade had reached far up the river by the sixth
century. Later, Muslim merchants traded up the river
for gold and ivory. At the point where the Zambezi
meets the Indian Ocean, the Portuguese explorer
Vasco de Gama supposedly found Arab boats laden
with gold dust. The news of this attracted large
numbers of Portuguese fortune seekers, who spent
four centuries on the lower Zambezi in search of
riches.