The small stream or creek that forms the beginning of a larger river; a source stream.
Compound of 'head' (source or beginning) + 'stream' (body of flowing water). This geographical term became standard in English by the 18th century as map-making and exploration vocabularies developed.
Headstreams are tiny ribbons of water you might step over, but they're surprisingly important to the ecosystem—they're where clean, cold, well-oxygenated water originates, making them crucial habitats for trout and other sensitive species.
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