10 kilometers, 10 miles or even 15 miles run and swim in the Lauwersmeer area, the largest nature reserve in the Northern Netherlands that was until 1969 the old Lauwerszee, a cove of the Wadden Sea. In this beautiful dammed piece of new nature around the port of Lauwersoog we have set out a route that takes the participants along the most beautiful and challenging pieces of nature in the Northern Netherlands.