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The largest jellyfish ever discovered was a Lion’s Mane jellyfish. It had a bell (body) with a diameter of 2.3 m (7 feet 6 inches) and tentacles 36.5 m (120 feet) in length. It was found washed up on the shore of Massachusetts Bay in 1870.
To put that into perspective, the largest blue whale ever recorded was a mere 110 feet long. Pathetic.