George Loegering, a retired engineer, couldn’t believe his eyes when he discovered a giant frozen circle on Saturday.

While hunting with relatives, George saw a spinning ice disk on the Sheyenne River in North Dakota. The massive pie-shaped ice measured about 17 metres in diameter and was found spinning in the river current. This natural phenomenon often turns up in flowing rivers in very cold climates. National Weather Services forecasters said that the Sheyenne ice disk appeared as a result of cold and dense air slowly freezing the river surface. The ice chunks were trapped in a river whirl, creating the rotating circle.

Similar ice circles have been discovered before in Canada, England and Sweden during winter.

Have you ever seen one of those?

Video Amazing spinning ice circle spotted in Sheyenne River, The Telegraph