Most participants in an orienteering event (multi venue)

According to Official Guinness Records,

On 23 May 2003 a total of 207,979 pupils from 1,381 schools across Switzerland took part in a simultaneous orienteering event organised by the Swiss Orienteering Association.

For a complete list of 2003 records, please visit 2003 Guinness Records in Switzerland.

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Other Switzerland records that might interest you:

• Largest swiss bell gathering
• Largest chocolate firework
• Farthest distance flown in a balloon
• First circumnavigation of the world by balloon
• Most expensive postage stamp