Most of the downstream Wouri in place Yabassi covered by ice background mainly black micaceous gneiss-embrediste and anatexite, granite syntectonique.
Many volcanoes in the north and west of the downstream. These volcanoes are made of basalt top of the third millennium, some minerals and basaltic rocks trachit fourth century.
In the Yabassi downstream, the river downstream Wouri covered coastal sedimentary sequences of the century creta white chalk. The entire area was under strong tectonics in the past and present of volcanism.
Land change very diverse; especially red soil ferralitique change from metamorphic rocks or earth brown basalt and basalt change.
Plants of downstream Wouri mostly thick green forest Atlantic have low and medium altitudes. Rain forest, the forest is characterized by Lophira alata in coastal areas and many species of plants in the pea average height.
Plants in sparsely populated areas Yabassi (grassland) and from Mbang to Nkongsamba (land and banana Robusta coffee). Over 1200km north and west, many sparse forests and prairies, as well as the cultivation of food crops and Arabica coffee.
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