What is the longest distance swam in nautical mile?

As of my last knowledge update in October 2023, the longest distance swum in open water is 139.8 kilometers (approximately 75.6 nautical miles) by Benoît Lecomte in 1998. This remarkable feat took place while crossing the Pacific Ocean. However, records may have changed since then, so it's advisable to check the latest updates from reliable sources for any new achievements.