Under Zimmerer, the Germans abandoned attempts to enter the principal Bell trading region in the Mungo River valley and turned instead to the Sanaga River, which they closed to all native traders.
The first European records of the people of the Douala region around the Wouri estuary noted that they were engaged in fishing and agriculture to some extent, but primarily were traders with the people of the interior via the Wouri River and its tributaries, and via the Dibamba, Kwa Kwa and Mungo rivers.
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