Rat Race Adventure Sports is giving two readers of The Wharf the chance to take on the challenge of a lifetime and win entry for themselves and a friend to London's first aquatic obstacle course.
Taking place on August 16, the 10km River Rat Race water course will see participants run, jump, swim, kayak and climb their way around The Docklands in East London.
The race will start inside the Excel centre with participants facing a quick fire barrage of obstacles before heading out on to the dockside.
From there, they will run west towards the Emirates Air Line, tackling more obstacles as they go. Participants will then enter the Royal Victoria Dock via a water jump which will be followed by a short swim and then an energy sapping, thigh deep wade onto an urban beach.
Back on dry land they then head east with a mixture of jumping, swimming and wading required, before the running kicks in again to lead them onto the kayak section.
From there it's homeward bound, but as it's a Rat Race event it won't be that simple - participants will be faced by more challenges and a few surprises before they cross the finish line.
This will include the centerpiece obstacle of the event - a towering jump, plummeting them 20ft into the water below. The River Rat Race is produced by leading adventure sports company Rat Race which organises the largest selection of adventure races in the UK.
For the chance to win this great prize, simply answer the following question: How many kilometres is the River Rat Race?
Send your entry straight to us via email at competitions@wharf.co.uk. Please write Rat Race Competition in the subject line of the email.
Entries without Rat Race Competition in the subject line may not be processed.
Your entry must also include your name, address and a contact telephone number.
The closing date for entries is Wednesday, August 6.
Go to ratrace.com for more details.