According to National Geographic, there are roughly 300 species of octopus and they can be found in every ocean on earth, where they enjoy feasts of intellectually inferior shellfish like shrimp, mollusks, and crabs. With that many species, there are also huge discrepancies in their sizes. Nat Geo reports octopuses can range from a wee half an inch (aww!) to as big as 30 feet across weighing up to 600 pounds (yikes!).
The largest known species of octopus is the Giant Pacific octopus, which lives, obviously, in the Pacific Ocean. According to Octolab TV, while it's known that octopus can get as big as 30 feet and 600 pounds, that's only because a dead one washed up on the shore of British Columbia, Canada. As far as science is concerned, that's the biggest one ever documented, but that doesn't mean there aren't bigger ones out there that have not been "properly documented."
Still, as far as what has been caught on camera, only the more average-sized Giant Pacific octopuses have been captured. According to Deep Marine Scenes they usually reach about 16 feet across, making them the biggest octopus ever to be filmed.
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