Touted as the “official Rotto rehearsal”, it is the last chance for swimmers to complete a 10km run to qualify for a solo Rottnest Channel crossing.
More than 900 competitors are expected to participate.
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Events of 5km, 2.5km, 1.25km and 150m will also be available.
Events manager Natalie Woolfitt said she was excited to see the event grow. “It was such a great community event last year and we’re excited to… have more people enjoying the water again this year,” she said.
Register at www.openwaterswimming.com.au.