Bikini Bottom is the main setting in SpongeBob SquarePants. Bikini Bottom is a moderately sized city which, according to Squidward, is in the middle of nowhere. It consists of many businesses, including restaurants, stores, and manufacturers. This city also has a booming economy, balanced educational and health systems, a well-structured government, and an exceptional law enforcement system. There are even stadiums, amusement parks, and other recreational facilities.
Rock Bottom is a deep sea trench located beneath Bikini Bottom. In fact, the road from there to here is so perfectly vertical, it can only be accessed by bus. Everything is pitch black except for a few street lights, and everyone in Rock Bottom speaks a language the same as English, except they blow a raspberry in between every two to four syllables. There is also a Kandy Machine as well as restrooms (though foreigners cannot tell which room's for men and which room's for women for they have weird symbols). A Bus Station is present, in which SpongeBob had a hard time catching one (as it kept arriving just as he looked away from the stop). Merlin's Cave is the residence of the weather magician of the sea which is difficult to access. There is also the WSEA news headquaters, the Rusty Anchor, which sells Coral Cola and Diet Kelpsis with a lemon twist. Known customers are Patrick, Plankton, and Mermaidman. In the game SpongeBob SquarePants: Battle for Bikini Bottom, the Rock Bottom Museum is shown. It features a lot of art work and has an advanced security system; Barnacle Boy works as a security guard there also. Trench of Advanced Darkness is a trench that is lower than the city itself.
Bottom's Up! is a very fancy city seen in the SpongeBob SquarePants: Employee of the Month videogame. The only thing that's not fancy is Cowfish Craig's shack. Other establishments include the Sublime Seafoods, Oxygen Springs, and the Waverly Hills neighborhood. Waverly Hills is a wealthy district on the cliffs of the Kelp Forest. The sky and water murk seems to be different here; it is always as if it is sunset. Once Sandy has been to this city.
Shell City, although not really a city but it's just a gift shop ("Shell City Marine Gifts and Sundries") on the surface owned by the evil Cyclops, selling dried out dead sea creatures. The road to Shell City is dangerous and no one has ever returned from there, which makes it the perfect place for Plankton to sell Neptune's crown. It is located on a beach where SpongeBob and Patrick meet David Hasselhoff. In a deleted scene of the movie (which can only be seen in The SpongeBob SquarePants Movie DVD), Shell City is actually a city and is where Sandy (who looks ugly on land to SpongeBob and Patrick) constantly gets pursued all over the place by squirrel exterminators in black suits. She also mentions that there are buses that arrive here going to Bikini Bottom. Although Shell City was filmed in Florida, the location in SpongeBob's world would land Shell City in Australia most likely because a sign in a SpongeBob book based on the movie says that Shell City is 3,000 miles away from the Thug Tug. The Thug Tug is not that far from Bikini Bottom. Bikini Atoll is approx. 5,000 miles from the United States, which could not mark Shell City in California.
Tentacle Acres - Also known as Squidville, this particular town is so unique, due to the fact that it is a gated community of millions of octopuses (and only octopuses) living in Easter Island Heads. Sponges and starfish aren't allowed to even set foot in this town, but SpongeBob and Patrick got in thanks to fried oyster skins that Patrick had eaten earlier. Activities here include bike riding, clarinet playing, croquet and interpretive dancing. However, childish games such as playing with reef blowers are not allowed in Tentacle Acres. Establishments besides the Easter Island heads, include the Full of Health grocery store (selling among other things: canned bread), an Interpretive Dance Academy, a Park, Le Cafe (Food Stand) an Ice Cream Stand, and the Security Office. Only one street name was revealed, in which Squidward stayed on, was New Life Street (Containing houses 302, 303, and 304).
AppleWorld - Mentioned by a worm in Rock-a-Bye Bivalve. Inside any apple where there's a worm.
Bikini Atoll - Bikini Atoll is the signature island above Bikini Bottom. The opening sequence of every episode of the show has the island shown right after Painty the Pirate (a painting) starts off the theme song. Sandy also dared SpongeBob, Patrick, Mr. Krabs, and Squidward to go on dry land here and survived in the episode Pressure (although birds did attack the group). Some episodes also start off and end with Bikini Atoll shown. To humans (like David Hasselhoff), the island also signals the way down to its aquatic counterpart. The place name is an ironic double-entendre, as the "bikini" two piece swimsuit took its name from the atoll, specifically to the connection between the nuclear bomb test at Bikini around the time that the new swimsuit hit the public "like a bomb".
Barnacle Bay - A city that was mentioned in the episode, "Fools in April". The only know establishment is the Art Museum, which also awards artists monthly. Also, as revealed in the SpongeBob book, "The Amazing SpongeBobini," a circus called the Stingray Brothers and Barnacle Bay Shrimp's Circus comes from this city and they performed in Bikini Bottom.
Karate Island (Condo Island) - An island where the "King of Karate" is crowned, but was actually later found out as a scam from real estate agents to buy time shares for condos. The "Karate" Tower is located on the island.
Quittersville One of the three places in which those have no where else to go, can go to.
Failuretown - One of the three places in which those have no where else to go, can go to.
Loserburg - One of the three places in which those have no where else to go, can go to.
Stupidtown - It was mentioned is when Patrick was sweeping the Krusty Krab floor with the wrong end of the broom, and a rude customer said "Hey pal, you just blow in from Stupidtown?"
China Sea - A place where one of SpongeBob's Mermaid Man and Barnacle Boy toys were manufactured in. A spoof of real-world China.
Area between Bikini Bottom's county line and the Monster Trench. It contains a stretch of sand hills as far as the eye can see. The Thug Tug is located within this place. A road goes through this area. The middle part of the road includes a lot of skulls.Also some of the road was gone where there monster trench begins although Patrick found a stair case to the bottom which makes noise when he stepped on it.
The Monster Trench, is a large trench in the middle of the Pacific Ocean, described as deep, dark, hazardous, and monster infested. A parody of the Marianas Trench
Between the Monster Trench and Shell City, this is where the cyclops spotted SpongeBob and Patrick.