An attempt to be in the Guinness World Records will take place in Mandurah over the Crab Fest weekend next month.
John Bolton from Access WA and Ian Napier and Graham Bishop from the Rotary Club have come together with the idea of starting the inaugural "world's biggest pontoon boat muster."
"We wanted to challenge ourselves and have a bit of fun so we wanted to see how many pontoon boats we could join together," Mr Napier said.
The pontoons will gather between the Old Mandurah Bridge and the Mandurah Estuary Bridge and then parade into the Mandurah Ocean Marina as part of the Crab fest celebrations.
Registration costs $30 per boat and proceeds will go to local charities including the children's ward at Peel Health Campus, water rescue and the Rotary club.
"It took a lot of processing to organise with the headquarters of Guinness World Records in the United Kingdom," Mr Bishop said.
"We have to follow a certain criteria and we must show photographs and have two official adjudicators there on the day to make reports."
The parade will start at 1pm on Saturday March 7 and organisers are expecting a big crowd.
"Hopefully it will be a stopping point for people over the weekend to come down and have a look and while they're there to make a donation," Mr Bolton said.
"If all goes well we would like to make it an annual event and try and beat our previous record the next year."