What is "dodentocht"

The Dodentocht (Dutch for March of the Dead) is a long-distance march of 100 kilometers organized annually in Bornem, Belgium, since 1970. The grueling march derives its name from the length of the march and the rough and forested terrain. At the 2016 edition, 12,608 participants had registered. A scouting group also organises a campsite for the participants; the campsite can hold 500 people that want to arrive earlier.