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An isogloss is the geographical boundary of a certain linguistic feature, e.g. the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. Dialects are typically demarcated by whole bundles of isoglosses, e.g. the Benrath line that divides High German and Low German; or the La Spezia-Rimini Line which divides the eastern Romance languages from the western ones.