- Pablo Fernández Álvarez
- 12:21:14 hour(s):minute(s):second(s)
- United States (Jupiter)
The fastest 100 km swim in open water is 12 hr 21 min 14 sec and was achieved by Pablo Fernández Álvarez (Spain) in Jupiter, Florida, USA, on 29 July 2019.
Pablo attempted this record to raise awareness for ocean conservation.