Longest line of swim rings / tubes

Longest line of swim rings / tubes
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Who
WDS - Human Access Project
What
620 people
Where
United States (Portland)
When
05 July 2013

The most people in a floating line is 620, achieved by WDS - Human Access Project (USA), in Portland, Oregon, USA, on 5 July 2013.

The attempt took place on the Willamette River.