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Published November 25, 2013, 11:03 PM

Rare ice circle spotted on Sheyenne River

Leonard, ND (WDAY TV) - George Loegring of Casselton spotted this ice disk while hunting over the weekend.

By: WDAY Staff Reports , WDAY

Leonard, ND (WDAY TV) - George Loegring of Casselton spotted this ice disk while hunting over the weekend.

This ice circle is entirely natural and quite rare. It formed over the weekend on the Sheyenne River about 10 miles Southwest of Leonard, ND.

It is the result of an eddy in the slowly-moving river. As the river began to freeze, the eddy froze as a perfect circle.

Ice circles are rare because they require just the right conditions: The river must be at the point of freezing, an eddy must be present and the current must be slow.

If the water is too fast, there is too much turbulence and the eddy is disrupted. If the eddy swirls too slowly, the river just freezes over without the circle.

These videos were taken by Loegering.

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