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.
^Vauchez A, Neves S, Caby R, Corsini M, Egydio-Silva M, Arthaud M, Amaro V. (1995). The Borborema shear zone system, NE Brazil. Journal of South American Earth Sciences. July–October 1995. 8(3–4):247–266.