This is a landscape that consists of drum-shaped mounds composed of glacial moraines. A drumlin generally refers to the oval-shaped mounds made up of supraglacial moraines with high clay contents. The long axis is aligned with the flow direction. The size variation is remarkable; whereas the heights range from a few metres to dozens of metres, and the lengths vary from a few hundred metres to two kilometres. Drumlins often cluster in the terminal moraines at the front of continental glaciers but are rare in the alpine glacier regions.