Police are appealing for witnesses following an assault on a man at Helston Boating Lake on Sunday.
The man in his sixties was "thrown" into the lake in Coronation Park, Porthleven Road, sometime between 4.30pm and 5pm.
He is believed to have been punched repeatedly.
The man needed hospital treatment for his injuries.
A 45-year-old local man has been arrested on suspicion of assault and released on police bail until February 28, 2014.
Anyone who witnessed the incident, or has any information that could assist, is asked to call Camborne CID on 101 quoting AH/14/98, or alternatively call Crimestoppers anonymously on 0800 555 111.
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