Nearly two thousand people took part in the Great East swim - among them two Olympic swimmers who are hoping to go for gold in the open water events at London 2012.
Russell Hookey spent the day at Alton Water near Ipswich and saw the action:
More top news
Generally cloudy with some rain or heavy showers at times.
Rain easing for a time, but heavy showers possible later.
22 Albatross boats, glamorised by the likes of Brigit Bardot and Prince Rainier, are sailing in Norfolk and Suffolk this weekend.