Slovenian marathon swimmer Martin Strel swam the entire length of the Amazon River, about 5,268 km over 66 days, setting the Guinness World Record for the longest journey swimming in open water.
Record no. MRB-2026-006430
Longest River Swim (Amazon)
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.