According to Wikipedia, the largest jellyfish ever discovered was a Lion’s Mane jellyfish, washed up on the shore of Massachusetts Bay in 1870. It had a bell (body) with a diameter of 2.29 meters (7 feet 6 inches) and (poisonous) tentacles 37 meters (120 feet) long. To put that into perspective, the largest blue whale ever recorded was a mere 110 feet long. Via pigjockey.com.

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