For anyone interested the Swaledale Marathon takes place every June as part of the Swaledale Festival.
It's a 24-mile race over some of the bleakest terrain you can imagine. There is no marked route so you have to learn the course or follow someone.
There is some gut-wrenching climbs and if I remember right you climb 4,000 feet in total.
It starts and finishes in Reeth village. It's all off-road and if you can do a road marathon in 3hrs you'll probably be ablle to get round this in just under 4hrs.
Boys (and girls if you think yer 'ard enough) this is a real tough one.
It's always fully subscribed by January so get your entries in quick