The edge or boundary area of a forest where it meets open land.
Compound of 'forest' and 'side,' following Middle English pattern of '-side' as a locational suffix. Similar to 'seaside' or 'hillside,' it describes proximity or position relative to the forest.
Forestside areas are ecological hotspots called 'ecotones'—they're where two different ecosystems meet and create unique conditions that support more biodiversity than either the forest or open area alone.
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