Swimming in the River Seine has for the most part been prohibited since 1923 due to contamination .

1.On July 17, Paris Mayor Anne Hidalgo finally swam in the River Seine.

2.According to theAthletic, her long-awaited dip was part of an effort to prove that the river cutting through the heart of Paris is safe for the athletes to compete in during the Olympics.

3.The river will host triathlon and marathon swimming events during the Olympics and the Paralympics, which kick off on July 26.

4.Hidalgo was joined Wednesday for a swim by two Paris 2024 officials: deputy for sport Pierre Rabadan and head of the organizing committee Tony Estanguet. Île-de-France region prefect Marc Guillaume also took a dip in the river.

5.The Seine has long been notoriously unsafe to swim in.

6.In fact, according to theAssociated Press, swimming in the river was banned in 1923 because of pollution.

7.According to a JuneNBC Newsreport, Hidalgo was supposed to swim in the river last month but delayed her swim, citing “weather” as well as “demands” of France’s snap election.

8.Concerns about the river’s viability for Olympic events remain active. According toCNN, the presence of E. coli in the river exceeded acceptable levels between June 3 and July 2 but was acceptable last week.

9.Significant efforts have been made to clean up the river ahead of the Olympics.

10.The AP reports that $1.5 billion was spent on infrastructure to catch contaminated stormwater before it drained into the river.

11.According toUSA Today, some Parisians are upset with the amount of money devoted to the cleanup efforts, which have had limited success, as well as the general stress the Olympics will cause the city. This has led to an online push to defecate in the river, though it’s unclear how serious this possible protest action is.

Woman in a wetsuit and goggles smiles while floating in a body of water

A person wearing a swimsuit, swim cap, and goggles is swimming outdoors in open water with another swimmer visible in the background

A woman in a wetsuit and robe smiles at the camera with a group of people in the background, some taking photos

I don't know who they are. Group of four people in athletic wear by a river, surrounded by media personnel taking photos and videos

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Three individuals on a dock: two standing and one kneeling. The woman in a wetsuit and swim cap waves. A man stands behind her, and another man kneels while holding a microphone

A person wearing swim goggles swims in open water, smiling at the camera

A woman outstretched arms above her head pulling her goggles over her eyes wearing a wetsuit with "orca" on the chest, standing in front of a body of water

Person swimming in a body of water wearing an orange life vest

Anne Hidalgo, wearing a wetsuit, smiles while swimming next to a man in open water

A man kneels on a dock near two standing individuals. One waves and the other smiles. They wear water sports attire near a body of water

Participants swim in the Seine River under a bridge during an event, with some climbing out onto a dock, surrounded by safety staff and boats

Anne Hidalgo stands among reporters and microphones, smiling slightly. She wears a sports jacket and appears to be at an outdoor event