Pretty much near the tropics. I think, with the exception of a big area of northeast Africa and a long thin bit of western South America, our "equatorial"-band of deserts is between the 10th and 30th parallels.

It looks like Somalia is in the rainshadow of the Ethiopian mountains. Western South Africa confuses me, but it seems to have something to do with cold ocean currents not adding enough moisture to the air in the first place. I also wonder if the Andes are tall enough to turn global wind patterns aside? Time for some reading!