Strabo, The Geography of Strabo, Volume 3…
“ A people on the west coast of N. Africa, about the situation of whom Strabo, Pliny, and Ptolemy are in perfect agreement with one another, if the thirty days’ journey of Strabo between them and Lixus on the west coast of Morocco, to the south of Cape Spartel, be set aside, as an error either of his information or of the text; which latter is not improbable, as numbers in MSS. are so often corrupt. Nor is this mere conjecture, because Strabo contradicts himself, by asserting in another place (b. xvii. c. 3. § 7) that the Pharusii had a great desert between them and Mauretania. ”
