The Sheyenne River in North Dakota was the spot for an amazing natural phenomenon recently.

A retired engineer named George Loegering found the spinning ice disk over the weekend, which he estimates to be over 55 feet in diameter.

National Weather Service hydrologist was asked about the disk, by the Associated Press:

What looks like a solid disk is actually a collection of ice cubes, which formed a circle thanks to the combination of cold air and an eddy in the river that kept the water warmer.

As if North Dakota needed more attention for the amazing things happening here.