SWIMMERS from South Africa, America and Australia will take part in the Henley Classic swim on Sunday.
More than 700 competitors are expected for the annual race, which is now in its 12th year.
Team GB open water swimmers Tom Allen and Caleb Hughes will take place in the men?s category, with fellow GB athlete Fern Davies in the women?s race.
Defending champions Alexander Studzinski and Beatrix Eisel will not be racing due to the German national trials this weekend.
The Henley Classic was founded by Henley Swim organiser Jeremy Laming and Tom Kean in 2004. The competitors swim 2.1km along the royal regatta course.
Mr Laming said: ?The Henley Classic is a special time of year for the Henley swim team and a chance for us to put on a great show for elites and recreational swimmers alike.
?When Tom and I first decided to swim up the regatta course in 2004, we couldn?t have possibly imagined what would follow.
?It seems to have become the summer solstice of the swimming world with swimmers coming back year on year.?