Longest distance swimming in relay (open water)

According to Official Guinness Records,

The longest distance swimming in relay in open water by an unlimited team is 684.75 km (425.48 miles) and was achieved by a group of 200 swimmers at Lake Camlough, Camlough, Northern Ireland, United Kingdom, between 9 to 19 September 2009.
In total over 200 swimmers took part in swimming around a 750 m circuit. Gavin Brown swam the Farthest distance in one leg, completing five laps (3,750 m) in 1 hr 04 min 34 sec. The event was organised by Padraig Mallon.

For a complete list of 2009 records, please visit 2009 Guinness Records in United Kingdom.

Related Images

Other United Kingdom records that might interest you:

• Largest life-size house made from LEGO®bricks
• Largest can-can dance
• Largest plastic duck race
• Most players at an internet poker room
• Most vaults in one hour