The longest journey swimming is 5,268 km (3273.38 miles) and was achieved by Martin Strel (Slovenia) who swam the entire length of the Amazon River, Peru/Brazil, from 1 February to 8 April 2007.

Martin swam as little as 9 kilometres one day and as much as 127 kilometres on one day as he swam the length of the river in 67 days. He started in Atalaya, Peru and finished in Belem, Brazil.