Emergency services were called to a report of concern for a man in the water at Houton Pier, Orphir in Orkney at around 11.55am on Thursday.
Police said the 63-year-old was taken to Balfour Hospital in Kirkwall, where he died a short time later.
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There are not believed to be any suspicious circumstances around the death.
A Police Scotland spokesman said: “Inquiries are ongoing to establish the full circumstances, however, the death it is not being treated as suspicious.
“A report will be sent to the Procurator Fiscal.”