Formally known as the Algodones Dunes or the Imperial Sand Dunes Recreation Area, the Glamis Dunes is a huge series of sand dunes west of the Colorado River, northwest of Yuma, AZ in California. The dune field stretches 45 miles north to south and 6 miles east to West. This photo shows only a portion of the dunes, looking north from the I-8 area. The dunes are extremely popular for off-road vehicles; this photo was taken on a relatively quiet Friday morning.