Ice circles
There are many otherworldly theories as to what creates mysterious rotating ice circles. According to scientists, they can be explained with physics.
Sometimes, on rare occasions, bits of ice get caught up in a circular current and begin to cluster together. As this rotating sheet of ice bumps up against the edges of the land, it gets smoothed into a circle.
Ducks have been known to take leisurely rides on these ice circles.
Photo: Luc Saffre, CC BY-SA 4.0
https://commons.wikimedia.org/wiki/File:Vana-Vigala\_j%C3%A4%C3%A4ratas\_(Jaanuar\_2016)\_cropped.jpg
https://time.com/5504483/ice-circle-maine/