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.

Drumlin formation diagram from the NPS
Long after the glacier retreats, a drulin provides clues to the glacier's formation. —Credit: US National Park Service
Photograph of Smith Drumlin Prairie, Wisconsin
This photograph of Smith Drumlin Prairie, Wisconsin, shows a ground view of the elongated hump shape of a drumlin. —Credit: Joshua Mayer
Photograph of a field of sunken drumlins, Ireland
Clew Bay (Irish Cuan Mó), Ireland, contains a field of sunken drumlins, or drumlins that are now partially underwater. —Credit: Éole Wind

Last updated: 16 March 2020