Between November 2000 and February 2001 , Australian professional marathon swimmer Tammy van Wisse spent 106 days stage swimming 2,438 km along the River Murray .
In 1993 , Graham Middleton of Corryong , Australia swam 2,336 over 138 consecutive days .
Between November 2000 and February 2001 , Australia professional marathon swimmer Tammy van Wisse spent 106 days stage swimming 2,438 km along the River Murray .
In 1993 , Graham Middleton of Corryong , Australia swam 2,336 over 138 consecutive days .