Jellyfish Fields is a vast area in which jellyfish reside which was first seen in the episode, "Tea at the Treedome." Over 4,000,000 jellyfish reside here, as evidenced in "Jellyfish Hunter". In "Born to Be Wild", it's revealed that Jellyfish Fields is 50 miles long. There are two entrances. (1 at the beginning and 1 at the end, so it streatches out to other towns.) Other creatures live there such as clams, leeches, poisin sea urchins ,and a giant green monster. It is also a place where SpongeBob and Patrick enjoy jellyfishing. Objects found are a Treasure chest, an anchor, and hooks. Features include seaweed, rocks, coral plants, and big cliffs. Also, every year, for 3 days, different kinds of jellyfish all over the world come to Jellyfish Fields. This is known as "Jellyfish Migration".
Known areas of Jellyfish fields
Jellyfish Rock: The main part of Jellyfish Fields.
Jellyfish Grotto: A cave where the discoverer of Jellyfish Fields studies about Jellyfish.
The Brain Coral Fields: A field of brain coral on the bottom of a cliff in Jellyfish Fields. If someone replaces their brain with brain coral from the field, their IQ changes. In the episode "Patrick SmartPants," Patrick falls off the cliff twice in to the field.
Jellyfish Caves are dark caverns in the middle of Jellyfish Fields, which is also in the foundation of Mount Spork. The caves lead to Jellyfish Lake.
Jellyfish Lake is a large Lake of goo, which also has a waterfall, that falls down from Mount Spork.
Mount Spork/Spork Mountain is the highest point of Jellyfish Fields, and the home of King Jellyfish. On the summit, King Jellyfish has a shower and bath tub.
Musical Stones of SpongeBob is a circlar of eight large stone replicas of SpongeBob, that when the wind blows through the holes, they create music, thus attracting jellyfish.