A participant tackles the Mud Mile obstacle during the 2012 Tough Mudder Challenge held in the grounds of Drumlanrig Castle, Dumfriesshire
A 12-mile obstacle course which sees participants run through flames and ice cold water has been held in Scotland for the first time.
Thousands of people descended upon Dumfriesshire to take part in Tough Mudder, which was designed by British special forces to test fitness, stamina, mental strength and camaraderie.
The challenge got under way today at Drumlanrig Castle and Country Estate in Thornhill, with more than 5,000 "mudders" taking part throughout the weekend.
Participants were challenged mentally and physically as they navigated their way over more than 20 obstacles including 12ft walls, across muddy trenches, through 4ft flames and into icy water.
They also braved their way across about 100,000 gallons of mud and through pits of stinging nettles, waist-high swamps and claustrophobic tunnels, as well as receiving 10,000 volts of electroshock therapy before crossing the finish line.
Described by organisers as "the toughest event on the planet", the extreme endurance challenge was the brainchild of Will Dean and Guy Livingstone and has already taken place in the US, Australia and Canada.
More than 500,000 people have taken part since it launched in May 2010.
Mr Dean said: "Other endurance runs lack excitement and a sense of team spirit, so we designed Tough Mudder to push mind and body to the limit whilst at the same time fostering a sense of team work.
"The event is not about finishing times or winning a first place medal; simply completing a Tough Mudder is a badge of honour.
"Having launched initially in the US, we're excited to bring Tough Mudder to Scotland."