In northeastern Mali are these low hills, called the Ifoghas, where enough elevation collects enough rain to make this …one of the most favored parts of the Sahara Desert. A high proportion of the drainages are green as they sweep down through the boney dark outcrops. A sand street has invaded the hills on the right, while to the far left a dust storm is rolling in off the notoriously desolate Tanezrouft Plateau.