Hundreds of swimmers took to the pool for the 28th Maidenhead Lions Club Swimarathon on Saturday.
Teams swam as many lengths of the Magnet Leisure Centre pool as possible in 55-minute time slots from 7am until 10pm, to raise money for good causes.
Scroll through a gallery of photos above and see Thursday's Advertiser for even more pictures.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.