This races is 125 miles long and starts in Devizes, near Bath, from where the competitors follow the Kennet and Avon canal until they meet the Thames which takes them into the heart of London (above).
It is a very tough race with 77 portages and the weather didn't help, being grim with grey skies and lots of rain.
There are two categories: those that do it in stages over the long weekend and those
To give an idea of how demanding it is: the non-stop race is the longest in the world and this year even Olympic legend Sir Steve Redgrave pulled out due to tiredness.
As you might have guessed, it was thought up in a pub.
Big "respect, mate!" to all those to have completed it.