Definition of 4daagse

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This hashtag is frequently used, but is considered 'unofficial'. #4d11 is regarded as the the official one for 2011, because @St_DE4DAAGSE is using it.

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The International Four Day Marches Nijmegen (or Vierdaagse) is the largest marching event in the world. It is organized every year in Nijmegen in mid-July. Participants walk 30, 40 or 50 kilometers daily, and, on completion, receive a royally approved medal.