Borborema Plateau
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Through Atlantic Ocean, Igneous rock and Metamorphic rock
The Borborema Plateau serves as an orographic barrier, despite its relatively low elevation, against the moist easterly winds of the Atlantic Ocean. Areas west of the plateau, which make up part of the sertão, are arid and prone to drought. The Pajeú River, the largest tributary of the São Francisco River, originates from the Borborema.
Geology
The Borborema Plateau is part of a huge anastomosing shear zone. The plateau is composed primarily of igneous and metamorphic rock.