On Sunday 13 April, more than 35,000 people will run through the streets of London for the 34th London Marathon.
The London Marathon is a flat course around the River Thames over a distance of 42,195,m. There are different starting points, but all of the courses join up and all runners finish on The Mall, by St James's Park.
The London Marathon is the largest fund raising event in the world. Participants have raised 800 million euros for charity since 1981. Around 80 per cent of runners run for charity, often wearing fancy dress. In 2011, one runner raised 2.8 million euros: that's a lot of money!
Some runners make money from the Marathon. Prizes start at around 730 euros for twelfth place and can go up to 40.000 euros. Winners can also get big bonuses if they break a record.
British runner Paula Radcliff holds the record for the fastest women in the London Marathon: two hours, 15 minutes and 25 seconds. Emmanuel Mutai from Kenya, holds the men's record: 2 hours, four minutes and 40 seconds.
One Englishman took five days, eight hours, 29 minutes and 46 seconds. He wore 50kg diving suit and shoes weighing 11kg each!
THE FINISH LINE!
In this photo, the runners are near the end of the Marathon. They are passing in front of Buckingham Palace and running down The Mall. The flags and palace inspire them to make an extra effort before the finish line.