Gangs of youths in groups of up to 50 have been told to stay away from a riverside area by bosses at Beccles Lido.
The lido and its neighbours have experienced problems with teenagers hanging around the riverfront, near the entrance to the pool.
The noise the teenagers caused resulted in complaints being made to Suffolk police.
To ensure the area remains peaceful, Beccles Lido have put signs up urging groups of teenagers to stay away from the riverfront.
Despite the signs the pool management has put up at the nearby riverfront, the lido is still saying that teenagers are welcome to use the pool.
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A Beccles Lido statement said: "The signs were put up in June. They are in the area by the river and apply to that area only.
"Teens, accompanied, unaccompanied and in groups, have always been and always remain welcome in the lido.
"The signs were put up at the request of Suffolk police following large gatherings of teens by the river, sometimes in excess of 50, and behaviour which had become unsafe to themselves and to other users of that area and pontoons.
"Teens have always been welcome, inside and outside the lido, but sadly gatherings in the river area became unmanageable."
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The area where the teens have been gathering is where the Big Dog Ferry, owned by Beccles Lido, offers boat trips along the picturesque River Waveney from Beccles Lido to the Locks Inn at Geldeston.
Beccles Lido collaborates with The Canoe Man to offer kayaks and stand-up paddleboards from the lido.
It had been forced to close its 6am swimming slots in April following noise complaints made by locals as pool users arrived to use the facility.
The lido is open all summer and more information can be found at www.beccleslido.com
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