Ice discs form on the outer bends in a river where the accelerating water creates a force called 'rotational shear', which breaks off a chunk of ice and twists it around.[2] As the disc rotates, it grinds against surrounding ice — smoothing into a circle.[3] A relatively uncommon phenomenon, one of the earliest recordings is of a slowly revolving disc spotted on the Mianus River and reported in an 1895 edition of Scientific American.[4][5]
https://en.wikipedia.org/wiki/Ice_circleBut I've seen other videos of people making their own.
https://icecarousel.wordpress.com/
https://youtube.com/shorts/7cDswmIUwYg?si=XHJonkPCFeZ8iuHk
https://www.instagram.com/reel/DSpV-8CEhhL/
?si=S3eRwOr17bJs1F6S
Here's the world record holder:
Fancy a spin? Quebecers in Abitibi break world record for largest ice carousel
An ice disk bigger than four CFL football fields has made a group of friends from Quebec's Abitibi region world record holders.
Jean-François Richard, along with ten of his friends and colleagues from Clerval, Que., about 100 kilometres northwest of Rouyn-Noranda, built the world's largest ice carousel last week, setting it spinning on Dec. 7.
"At this time of the year, there's not so much to do over there," Richard told CBC's Breakaway. "It's cold, not enough snow to do snowmobile, so we just decided to say, 'Hey, let's do it!'"
...
https://www.cbc.ca/news/canada/montreal/ice-carousel-world-record-1.5392242
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