Glacier Landforms: Drumlins

Drumlins are elongated, teardrop-shaped hills of rock, sand, and gravel that formed under moving glacier ice. They can be up to 2 kilometers (1.25 miles) long.

Photograph of Smith Drumlin Prairie, WisconsinThis photograph of Smith Drumlin Prairie, Wisconsin, shows a ground view of the elongated hump shape of a drumlin. —Credit: Joshua Mayer

Photograph of a drumlin field, Ontario, CanadaThis field of drumlins was photographed while flying over Peterborough County in Ontario, Canada. Note the drumlins are all aligned in the same direction, which indicates the direction the glacier flowed. —Credit: Sean Marshall

Photograph of a field of sunken drumlins, IrelandClew Bay (Irish Cuan Mó), Ireland, contains a field of sunken drumlins, or drumlins that are now partially underwater. —Credit: Éole Wind