Where does this come from, and can I check it?

The Greek runner covered 303.5 kilometres in a single day in 1997. The figure is taken from International Association of Ultrarunners, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a records & extremes fact?

Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Yiannis Kouros ran 303 kilometres in 24 hours

The Greek runner covered 303.5 kilometres in a single day in 1997 Kouros covered 303.506 kilometres on a road circuit in Adelaide in 1997, an average of about 12.6 kilometres per hour for a full day. Ultrarunning records on measured loops are counted by completing laps, with the final partial lap measured by officials. He also holds the 48 hour and multi-day marks, and no runner has come within 10 kilometres of the 24 hour figure. It sits in Mondo's records & extremes collection, one of 200 facts that each trace back to the reference below.

Where this comes from

International Association of Ultrarunners

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: running, endurance, records

Yiannis Kouros ran 303 kilometres in 24 hours: the short answers

Where does this come from, and can I check it?: The Greek runner covered 303.5 kilometres in a single day in 1997. The figure is taken from International Association of Ultrarunners, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a records & extremes fact?: Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.