Farthest 6 days ultra distance track (women)

According to Official Guinness Records,

883.631 km (549 miles 110 yards or 549.062 miles) Sandra Barwick (New Zealand)
Campbelltown, New South Wales, Australia
18-24 November 1990

For a complete list of 1990 records, please visit 1990 Guinness Records in Australia.

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Other Australia records that might interest you:

• First person to sail around the world solo and non-stop (female)
• Longest distance sailed non-stop by any vessel
• Longest series of sailing circumnavigations
• Fastest run 400 metres (female)
• First row across two oceans by a team of two