Jan Knippenberg (Hoek van Holland, nineteen april 1 948 - Texel, twenty-three november 1 995) was a Dutch ultra runner and historian. He was a pioneer of ultra running in the Netherlands. He ran in 1974 in 18 days from the Hook of Holland to Stockholm (1600 km). In 1979 he ran the 400 km around the IJsselmeer in 43 hours and 17 minutes - an unofficial world record.
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