The aim is to complete, on foot, a route of either 16 or 25 miles within maximum time periods of 8 or 9.5 hours respectively. The 8-mile checkpoint will have cut-off times included in the route description; if later than this, you must return on the 16-mile route
You can use the interactive controls to zoom in and out and to move around the map, or click on a marker for more info. (interactive map help)