Hundreds of adrenaline junkies of all ages swooped down on Foymore Lodge, Portadown, on Sunday for the biannual Mud Madness off-road challenge.
The event, according to its website, is Northern Ireland's muckiest and best off-road challenge.
Competitors from all over the United Kingdom, as well as Germany and the United States, take on two laps of a muddy 4.5km course strewn with obstacles, including cargo nets, monkey bars and tyres, to raise funds for Marie Curie's care and support services for people with terminal illnesses.
The event has raised more than £150,000 (S$290,000) over the past decade for the charity, which is best known for its network of Marie Curie nurses who provide hands-on nursing care in patients' homes.
The next Mud Madness challenge will take place in Aberdeen, Scotland, next month.