Thousands turned up to watch and cheer on charity mud racers as they slogged across a 440m (1,440ft) stretch of riverbank at low tide.
The annual Maldon Mud Race in Essex saw Vicki Riley claim the title of fastest woman, while first-timer Joe Griggs was the first man to cross the finishing line.
Most people managed to complete the task, but a handful of straddlers had to be extracted by paddle boats and ropes as the tide started to rise.
Here are a few pictures of those plucky people, who helped raise some £40,000 for Essex charities.
- As it happened: Live reporting from the Maldon Mud Race
- Watch mud race video on BBC Essex's Facebook page