After miles and miles and miles of the Sonoran Desert, you come upon these sand dunes along route 8 and the sight is amazing. I had visited the sand dunes in Death Valley and these are just as stunning. Had to stop and take pictures, but as it was a very hot day, we decided not to try to hike in and up them. Evidently, these dune run about 45 mikes long! and are part of the Algodones Dunes. Astounding sight to behold.