The Yorkshire 100km Marathon Charity Walk, based at Darley Memorial Hall, will take place over the weekend of 23 and 24 June, starting on Saturday morning at 9am.
Around 200 intrepid adventurers from across the country are expected to start the momentous journey on behalf of Blind Veterans UK and Guide Dogs.
The route takes them from Darley to Brimham Rocks, Ripley, Arkendale, Knaresborough, Pannal, Norwood and Hampsthwaite, before arriving back at Darley.
A spokesman for the event said: “If you don’t fancy the walk, you can still help by cheering the walkers on their way as they go past. The first arrivals are expected back in the middle of the night, but the majority will be arriving from Sunday morning until later that afternoon.”
Email www.blindveterans.org.uk/100k/Yorkshire for information about entering or volunteering at the walk.