Stichting Duinenmars organizes a two-day walking event every year. Approximately 12,000 walkers participate in the Duinenmars each year, making it the largest walking sport activity in the Randstad.
Stichting Duinenmars organizes a two-day walking event every year. Approximately 12,000 walkers participate in the Duinenmars each year, making it the largest walking sport activity in the Randstad.