Most southerly marathon

According to Official Guinness Records,

The most southerly marathon is the Antarctic Ice Marathon held on the Antarctic mainland, taking place at a latitude of 80 degrees south. This race has been held annually since 2006.

For a complete list of 2006 records, please visit 2006 Guinness Records in Antarctica.

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Other Antarctica records that might interest you:

• Largest desert (cold)
• Most sparsely populated continent
• Highest Seasonal Population Difference