It's been compared to crop circles, or the strange handiwork of aliens. Others say it looks like the Moon, if it somehow materialised in the chilly waters of the Presumpscot River.
But this massive churning formation in the city of Westbrook, Maine isn't evidence of something from outer space, but rather a bizarre and brilliant example of a natural terrestrial phenomenon called an ice disc.
These strange, spinning spectacles are incredibly rare sightings, but even so, this one – estimated to measure about 90 metres (300 ft) across – is a giant amongst its little-seen kind.
See it on YouTube.
Read the full story.
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