10.5 or 21.1 km You can choose a distance of 10.5 or 21.1 km and whether you want to walk one or two days. If you choose two days for the 21.1 km, half marathon distance, you will complete the full Egmond Walking Marathon. If you choose the 10.5 km, quarter marathon on both days, you will walk a total of half a marathon. The course of both distances runs over the beach and through the Noordhollands Duinreservaat. Routes through a beautiful nature reserve that can also be a tough challenge due to the loose sand, changing weather conditions and rolling terrain.