Messa is, according to Gräberg, a walled city, built by the Berbers, not far from the river Sous, and divided like nearly all the cities of Sous, into three parts, or quarters, each inhabited by respective classes of Shelouhs, Moors, and Jews. Cities are also divided in this manner in the provinces of Guzzala and Draha. The sea on the coast of Sous throws up a very fine quantity of amber.