Eskers are long, winding ridges of sand and gravel that form from the meltwater of glaciers. As glaciers retreat, streams of water flow beneath them, carrying sediment. When the water slows down, it deposits this material, creating a raised ridge that can stretch for miles. These unique landforms are often found in glacial regions and provide important clues about past climate conditions. Eskers can vary in size and shape, and they are sometimes used in construction or as natural trails for hiking. Their distinctive appearance makes them fascinating features of the landscape.