A small loch close to Loch Ness. It was proposed by Charles Rothschild as a potential nature reserve for its birdlife. No further details are given in the SPNR documentation on the site but it is likley that one of the species Rothschild was interested in was the slavonian grebe, as Loch Ruthven is one of the best places in the UK to see this rare bird.
(Above) the original SPNR survey documents for Loch Ruthven


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