Dunes and People - Dune Worlds: How Windblown Sand Shapes Planetary Landscapes - page 266

Fig. 23.7 Small barchanoid dunes intrude onto the road in the Liwa oasis, United Arab Emirates. This occurs preferentially on the top of
megabarchan dunes, where the wind is accelerated and there are no date palms to trap the sand. Photo courtesy Jani Radebaugh