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The original was posted on /r/todayilearned by /u/dooodaaad on 2025-06-24 18:24:48+00:00.

Original Title: TIL in 2009 a Maryland wastewater treatment plant was found to be inhabited by over 100,000,000 orb-weaving spiders, the largest recorded aggregation in history. The entire facility was covered in dense sheets and volumes of webbing, leading to it being nicknamed it the “Back River Arachnotopia”.