Red Sand Dunes are natural formations characterized by their striking reddish color, which is often due to the presence of iron oxide in the sand. These dunes can be found in various locations around the world, including Namibia and Vietnam. They are shaped by wind and erosion, creating unique patterns and heights that can reach several meters. Visitors to Red Sand Dunes often engage in activities like sandboarding and photography, taking advantage of the stunning landscapes. The dunes also provide a habitat for various plants and animals adapted to the arid environment, contributing to the ecological diversity of the area.