Young people from across the West Country have set up camp on Dartmoor as they prepare to take on the legendary Ten Tors challenge.
It takes place every year on Dartmoor following the May public holiday and for many, the challenge has been described as a "life-changing experience".
What is The Ten Tors Challenge?
up to 55 miles to navigate
The challenge, organised by the British Army, is attempted by 2,400 teenagers in 400 teams of six.
The teams navigate routes of 35, 45 or 55 miles (depending on age) over the Northern half of Dartmoor.
They visit ten nominated tors, which act as check points, in under two days.
Teams must be self-sufficient so they have to carry all that they need to complete their route and stay out overnight safely.
Where does the challenge start and end?
The Ten Tors and Jubilee Challenge events take place across Friday 10th to Sun 12th May 2019. Both start and finish at Okehampton Camp.
What is the Jubilee challenge?
The Jubilee Challenge is a separate event on the Saturday, aimed at younger participants with physical or educational needs.
As individuals or as members of teams, they must cover, on foot or by wheelchair, one of four specified routes with a distance of up to 15 miles.
What will the weather be like?
Has it ever been cancelled?
In 1996, the event was abandoned because of heavy rain and snow overnight and a mass evacuation from the moor was organised.
Foot and mouth disease in 2001 meant the event was also cancelled but went ahead the following year.
In 2007 the event was again abandoned on account of torrential downpours.
What safety measures are in place?
The British Army, who run the event, are supported by the Royal Navy and Royal Air Force.
They work alongside Dartmoor National Park Authority and the search and rescue group to ensure the safety of all participants.
Devon and Cornwall Police also work closely with the organisers throughout the training period and the event.