A geographical formation; a smooth, elongated hill or ridge of glacial material shaped by ice movement.
From Irish/Scottish Gaelic drumainn or drumlin + -er. Related to drum (low ridge). These features are particularly abundant in Ireland, Scotland, and Scandinavia from glacial activity.
Ireland has thousands of drumlins—so many that the landscape looks like waves frozen in earth, and geologists now realize they hold clues to how ancient ice sheets moved!
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