Ice circle

Ice disk on Vigala river (Estonia) filmed by a drone, January 2019.
Ice circles on the Doncaster River, Quebec
A long exposure image showing the rotation of the large ice circle on the Esopus Creek in New York

Ice discs, ice circles, ice pans, ice pancakes[1] or ice crepes are a very rare natural phenomenon that occurs in slow moving water in cold climates. They are thin circular slabs of ice that rotate slowly on a body of water's surface.

  1. ^ "Ice pancakes float along a river in the Highlands". BBC News. Retrieved 18 September 2021.