the valley, here contracted into a glen, allowed room only for the stream, and a narrow walk amidst the rough coppice-wood which bordered it.
Jane Austen. Pride and Prejudice (1813)
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we wandered for some time through the small glens near the orchard, poking under rotted logs and crawling around the rim of the sparkling tarns, where the tiny toadstools grew in profusion.
Diana Gabaldon. Outlander (1991)
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Here the storms in the roaring glens between the outermost whales, were heard but not felt.
Herman Melville. Moby Dick
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the valley of Gimmerton, with a long line of mist winding nearly to its top (for very soon after you pass the chapel, as you may have noticed, the sough that runs from the marshes joins a beck which follows the bend of the glen).
Emily Brontë. Wuthering Heights (1847)
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Mrs. Miggins: Yes, yes. Show me the glen where the kipper roams free. And forget Morag forever.