Sand masses are large accumulations of sand that can be found in various environments, such as deserts and coastal areas. They are formed through the natural processes of erosion and deposition, where wind or water transports sand particles and deposits them in specific locations. These formations can take the shape of dunes, beaches, or sandbars. In deserts, sand masses often create vast landscapes known as sand dunes, which can shift and change shape due to wind patterns. Coastal sand masses, like beaches, are shaped by the action of waves and tides, providing important habitats for various species and influencing local ecosystems.