Floating bogs, this one was pushed around by boats https://youtu.be/X2AG6LAOBYo
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Wasn't this phenomenon documented in a Terry Pratchett book?
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3 comments in c/greenspace@beehaw.org view that post
I think its not a matter of vanishing and reappearing, but it is floating. It moved 30km from the last location or something. So it has to get spotted again
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