Thousands take Tough Mudder challenge at Drumlanrig Castle
Thousands of competitors are descending on Drumlanrig Castle in Dumfries and Galloway to face a gruelling obstacle course challenge.
The Tough Mudder event is being held at the site near Thornhill over the weekend.
Organisers said they expected more than 14,000 people to take part in the event.
Tough Mudder is a team-based event which sees groups try to complete a 10 to 12 mile "mud and obstacle course".
Vice President Nikki Emmans said: "Tough Mudder is delighted to return to Drumlanrig Castle this weekend."
"We will be hosting Tough Mudder on Saturday and then on Sunday we have a brand new event for 2016, Tough Mudder Half.
"We are anticipating over 14,000 participants over the weekend and are excited to return to such an iconic venue."