The hallowed Finnish Jukola Relay is the biggest orienteering relay race in the world. The name Jukola is a family name taken from the Finnish novel, Seven Brothers.
Held annually since 1949, it is held at sunset sometime between the 13th and 19th of June, with competitors racing through the night, using powerful head torches for the first 3 to 4 legs.
Seven runners run legs of between 7 and 15km, with the winning team finishing usually at around 6 or 7am. The race is contested by upwards of 1500 runners each year, from an international array of teams.