https://kids.guinnessworldrecords.com en

Fastest two-way relay swim crossing of Lake Geneva (mixed)

Fastest two-way relay swim crossing of Lake Geneva (mixed)
Apply Now
Who
Jonathan Singh, Kate Norton, Katie Glass, Dora Sari, François Bonnici, Alexander Seeger
What
50:37:58 hour(s):minute(s):second(s)
Where
Switzerland (Chillon Castle)
When
20 August 2025
Age Restriction: Applications for this record title will only be accepted if the applicant is 16 years of age or over.

The fastest two-way relay swim crossing of Lake Geneva (mixed) is 50 hours 37 minutes 58 seconds, achieved by Alexander Seeger (Switzerland), François Bonnici (South Africa), Dora Sari (Hungary), Katie Glass (Canada), Kate Norton and Jonathan Singh (both UK) on 18–20 August 2025, as ratified by the Lake Geneva Swimming Association.

This is the first time that any swimmers have attempted a two-way swim of Switzerland's largest lake, covering a total distance of more than 140 km (87 mi). The route followed was from Chillon Castle in Veytaux to Bains des Pâquis in Geneva and back to Chillon Castle.

All the team are members of the Open Water Swim Coaching group based in Geneva, which was founded by Alex Seeger in 2012. As well as taking on an unprecedented swimming feat, the swimmers also wanted to raise funds and awareness for the charity National Sea Rescue Institute in support of their Water Safety Education Initiative, which teaches kids how to stay safe when in the water.