The Kelp Forest is a large forest that is on the outskirts of Bikini Bottom that appeared in "Club SpongeBob", "Bummer Vacation", "To Save a Squirrel" and Eek, an Urchin!. It has also appeared in numerous video games. Instead of trees, there are huge kelp plants. It seems to be more like a jungle than a forest. It is inhabitated by a large range of animals. Inside, there is a meadow that SpongeBob, Patrick, and Squidward used as a camping area when they were trapped there.
The Kelp Forest first appeared in "Club SpongeBob". It was the main setting of the episode. SpongeBob, Patrick, and Squidward land in the Kelp Forest after Squidward tried to leave SpongeBob's clubhouse and accidentally caused the tree that it was on to bend and then fling the clubhouse into the forest. Squidward attempts to escape. When he gives up, he tries to survive. SpongeBob and Patrick follow the advice of a toy called, "The Magic Conch Shell". They do nothing until a conveniently timed airplane crash causes them to gain food because the pilot dropped the load, which was picnic supplies. Squidward attempts to eat the food, but the Magic Conch Shell will not allow him to. Eventually, a Forest Ranger arrives to save them, but he also follows the advice of the Magic Conch Shell, which leads the four to do nothing.
The Kelp Forest then appears again in "Bummer Vacation" when Mr. Krabs tries to get rid of SpongeBob. SpongeBob is working too much at the Krusty Krab, so Mr. Krabs forces SpongeBob to take a vacation. However, SpongeBob does not want to and uses several attempts to get back in, which all fail. Finally, Mr. Krabs has had enough, so he tells SpongeBob that he will take him home. However, they drive past SpongeBob's house and end up at the Kelp Forest. Using SpongeBob's spatula, Mr. Krabs tells SpongeBob to go fetch it and SpongeBob does, but before he can get back, Mr. Krabs is gone.
The Kelp Forest returns in "To Save a Squirrel" as the general main setting of the episode. SpongeBob and Patrick are forced to try to survive after falling out of Sandy's Truck. In the end, Sandy reveals that it was a test to see if they were strong enough to survive.
The Kelp Forest returns 4 seasons later in "Eek, an Urchin!". After a run in with some Sea Urchins, SpongeBob is tasked to get rid of them. He goes father away from the Krusty Krab. He eventually comes to the Kelp Forest and calls Mr. Krabs, who tells him to go farther.
The Kelp Forest then appears in The Yellow Avenger, where he has to hide something for Patrick, get some kelp for Gary's snail food, and deliver some pickles to customers who got Krabby Patties that don't have pickles on them.
Kelp Forest Road is a road that runs through the Kelp Forest. This was only seen in "Bummer Vacation", when Mr. Krabs drove SpongeBob far away from the Krusty Krab in order to keep him from coming back until after his vacation time is up. It is most likely the road is used for hikers.