Eskers are long, winding ridges of sediment that are formed by glacial meltwater. As glaciers move, they carry debris and sediment, which gets deposited in the meltwater streams flowing beneath the ice. When the glacier retreats, these deposits remain, creating a distinct landform that can stretch for miles.
Typically composed of sand and gravel, eskers can vary in height and width. They often appear as elevated hills or ridges in the landscape. Eskers are important for understanding past glacial activity and can also serve as valuable sources of sand and gravel for construction.