A mysterious circle of ice was spotted spinning in the Middle Fork Snoqualmie River near North Bend, Washington, on 7 January.
The stunning winter sight was the result of water flowing around the river bend.
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A sheet of ice spun against the surrounding ice to create a smooth disc, according to Fox Q13 Chief Meteorologist Walter Kelley.
Kelley told Q13 Fox: "Calm winds this week combined with six mornings in a row in the low 20s made for perfect conditions to form the circles."