These are the Mesquite Flat Sand Dunes and Death Valley and was one of my top objectives for photographing on this trip. I tried to keep pushing back our arrival at the dunes as late as I could to get the late day light and the shadows that it would produce. Unfortunately we had somewhere to be that was another 4 hrs away, so I had to settle for about 4 pm sunlight. They were still cool though and as a word of advice to anyone else wanting to photograph the sand dunes in summer: Don't wear sandals - the sand was extremely hot.