VIDEO: Massive ice disk spins in Maine river

A giant ice disk is floating in a river in Maine. Although many are comparing this to an alien spacecraft, the City of Westbrook says the disk formed naturally. (WWMT/CBS)

Think of it as a crop circle, but in a river.

The curious formation in Greater Portland is a spinning ice disk that is roughly 100 yards (91 meters) wide, and it's been garnering quite a bit of attention, on site and online.

The formation in the Presumpscot River was widely shared on social media and has drawn comparisons to an alien spacecraft, a carousel and the moon.

The oddity drew a crowd that stood mesmerized by the slow-turning disk Tuesday, Jan. 15, 2019, in Westbrook.

The ice formation is believed to have formed naturally in a part of the river where there is a circular current, creating a whirlpool effect, said Tina Radel, the city's marketing and communications manager.

Residents of the area said they've seen smaller ice disks before, but nothing like this one, Radel said.

Rob Mitchell, who owns a nearby office building, spotted the alien-looking disk Monday and immediately notified the city.

Officials said the disk is spinning slowly counter-clockwise, and has served as a big raft for ducks and other birds. "The ducks were rotating on this big Lazy Susan," Mitchell said.

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