Some held signs and placards calling for clean oceans while others wore costumes as people were seen paddle-boarding out into the ocean.
Among the demands from activists was an end to sewage discharges into all bathing and high-priority nature sites by 2030.
The campaign, coordinated by Surfers Against Sewage (SAS), saw protests at more than 30 locations.
In Brighton, Olympic gold medal runner and keen paddleboarder Dame Kelly Holmes addressed demonstrators through a megaphone before leading dozens in a paddle-out.
In Falmouth, surfers paddled out en-masse while sea-kayakers carried placards on their boats calling for fish not faeces. Meanwhile, more than 200 people entered the water at a wild swimming spot at Ferris Meadow Lake in Surrey.
Emma Jackson, who organised the Shepperton Open Water Swim event, said she was contacted by SAS after setting up a campaign to save the lake from the River Thames Scheme, which will build a new flood relief channel through the area.
She said the lake naturally cleans itself and was much safer to swim in than the Thames but, under the proposal, the lake would be connected to the river, leaving it in danger of contamination.
Diese Geschichte stammt aus der May 19, 2024-Ausgabe von The Independent.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
Bereits Abonnent ? Anmelden
Diese Geschichte stammt aus der May 19, 2024-Ausgabe von The Independent.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
Bereits Abonnent? Anmelden
Fernandes saves ponderous United with extra-time goal
A stray punch got the battle of Britain going, but it took the right boot of Bruno Fernandes to decide it.
Keys overcomes Swiatek power in semi-final thriller
Tennis has seen its fair share of mesmerising performances.
RFU chief executive vows to stay despite bonus row
A defiant Bill Sweeney has vowed to continue as chief executive of England's Rugby Football Union (RFU) until the 2027 Rugby World Cup, even as he faces a revolt within the game over his tenure.
Canelo vs Crawford is the super fight with a twist
Mexican idol and US star set for September meet as fight fixer Turki Alalshikh strikes again,
Consumer confidence in economy falls to new low’
Consumer expectations for the economy have plunged as the government faces continued pressure over public finances.
SLAVE TO THE BEAT
On 'Eusexua', her defiantly weird paean to the Prague rave scene, FKA twigs bends vital new electronic shapes, writes Helen Brown, while rapper Central Cee's debut delivers
Think kink: the distinctions between BDSM and abuse
Olivia Petter talks to sex educators about what differentiates a consensual sexual practice from abusive behaviour, and why it's so crucial for partners to understand these polarities
Air pollution crisis in focus ahead of Delhi's election
Toxic air in India’s capital, population more than 33 million, has become a key political issue,
Lost Tina Turner track casts light on her return to fame
A surprise treasure has been unearthed from Tina Turner's vaults: the previously unheard track \"Hot for You, Baby\", which was intended for use on her fifth solo album, Private Dancer.
Could Britain really join a European customs union?
Europe's new trade official responsible for post-Brexit negotiations has said a \"pan-European [customs] area\" is something the EU could consider as part of \"resetting\" relations between the UK post-Brexit and the EU.