Trend surface analysis is employed to construct statistically significant trend maps of the areal variation in average grain size, sorting coefficient and roundness values of aeolian sand particles from the Namib sand sea, the Richtersveld and the Sandveld. All three parameters indicate that the sand is transported north in the Sandveld, west in the Richtersveld, and northeast in the Namib sand sea. This movement probably constitutes another minor source of Namib sand.