The Sandhills are a visually striking landscape in Nebraska, consisting primarily of…sand (obviously) and grass.  The sand is composed of finely-ground quartz that have been deposited over thousands of years. The accumulation of sand formed the dunes that characterize the Sandhills.  It's important to note that the sand is not loose like the sand found on beaches. It is stabilized by a deep-rooted grass cover, which is a defining feature of the region. The grass, consisting of varieties like buffalo grass and western wheatgrass, plays a crucial role in anchoring the sand dunes and preventing them from shifting extensively.