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WATCH: Huge Rotating Ice Disc Forms In Maine River

WESTBROOK, Maine (CBS Local) — A massive disc of ice has formed in the Presumpscot River in Westbrook, Maine, a suburb of Portland.

Tina Radel, Westbrook's marketing and communications director, posted images of the Westbrook Ice Disc on social media, saying the ice is slowly rotating counter-clockwise and that birds have been using it as a resting area.

More photos of the amazing naturally occurring phenomenon, the massive Westbrook ice disk. ❄️

Posted by City of Westbrook on Monday, January 14, 2019

"It looks like the moon has landed in Westbrook!" the city wrote on Facebook Tuesday morning.

No exact measurement of the Westbrook Ice Disc has been taken, but in video shot from a drone and shared by the city, it appears larger than two nearby downtown buildings.

Westbrook resident Adam Farnsworth also documented the Westbrook Ice Disc with a drone and shared it on Facebook.

The Ice Circle in my backyard! Check it out! It's amazing !!!!!!!!!!!!! I also want to thank everybody for sharing my video and this story of my hometown of Westbrook!!! Here's a YouTube link where I land on it! https://youtu.be/nP-l8Use1qA This is a like to my SoundCloud for the full track I created on my Roland jdxi. https://soundcloud.com/adam-farnsworth-4/starship

Posted by Adam Farnsworth on Monday, January 14, 2019

Ice discs like the one in Maine are not uncommon when atmospheric conditions are just right, the Bangor Daily News reports.

Citing a 2009 Daily Mail report, the newspaper says the discs "occur at bends in the river where the accelerating water creates a force called 'rotational shear,' which breaks off a chunk of ice and twists it around" and "as the disc rotates it grinds against surrounding ice, smoothing into a perfect circle."

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