drumlin

thumb|Drumlins around Horicon Marsh, Wisconsin, in an area with one of the highest concentration of drumlins in the world. The curved path of the [[Laurentide Ice Sheet is evident in the orientation of the various mounds.|380px]] thumb|Elongate and Magellanic subpolar forests|forested drumlins south of [[Puerto Williams, Chile. Flow direction here was at time of formation from west to east (left to right on picture).]]

A drumlin, from the Irish word ("little ridge"), first recorded in 1833, in the classical sense is an elongated hill in the shape of an inverted spoon or half-buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine. Assemblages of drumlins are referred to as fields or swarms; they can create a landscape which is often described as having a 'basket of eggs topography'.