Tony Rutter had to navigate New York's busy waterways at night to achieve his charity challenge.
Each one of the swimming challenges has presented its own difficulties.
The 20.5 mile English Channel swim saw him face strong currents and cold temperatures, while the Catalina Channel - stretching 21 miles between Santa Catalina Island and Los Angeles - came with prevailing winds, meaning he had to "break the back" of his evening swim before they picked up.
"We had a bit of an altercation with a tanker driver asking us to move out of his way in the Hudson River. He said he couldn't think of 'anything more stupid than swimming the Hudson in the middle of the night' but it was all part of the experience," added Mr Rutter.Mr Rutter said he realised how much effort he had put into it afterwards - when he "got into a taxi and fell asleep".
He has raised money for charity from his aquatic challenges, with his latest going to help St Oswald's Hospice in Gosforth.
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