A very much, back to basics, ultra marathon. None stop, self sufficient, ultra marathon with 118 km - 73 miles over 4000 ft of accent The anti clockwise route visits the upper Colne Valley, Spen Valley and Holme Valley and passes Dewsbury, Holmfirth and Marsden. Highlights on the route include a series of picturesque reservoirs including Holme Styes, Ramsden, Digley and Bilberry Reservoirs. Most of the route is way marked but you will require basic navigation skills (some of this, you will be doing at night... we will NOT assist! The required maps and route descriptions are available for down load. (we did complete the whole recce without maps, but we also know the area!) Cut off time (21 hours) will be in force NO exceptions, if you can't make the cut off don't enter.