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Scottish LassBBC News: Fish, eels and birds killed in river pollution incident
"A chemical, thought to be caustic soda, is understood to have entered the water at the Knockando burn, which flows into the River Spey, in the last few days."
https://www.bbc.co.uk/news/articles/c78k57py38do
The Spey cycle way builders thoughtfully managed to provide some olfactory stimulation every few miles.
Speckdäne