White Sands 1
White Sands National Monument, in southern New Mexico, is a fun place to visit. It's kind of in the middle of nowhere, so there aren't usually many visitors. The sand, itself, is made of eroded gypsum crystals. These tiny crystals would, under normal circumstances, be dissolved by rainwater and carried out to the sea, but the Tularosa Basin, where White Sands is located, has no outlet to the sea, so the dunes remain.
Available in the following sizes (Rectangle B): 12x8, 18x12, 24x16, 30x20, 36x24, 45x30, 60x40, 72x48.