Bikini Bottom is a fictional city that appears in the Nickelodeon animated television comedy, SpongeBob SquarePants. Located at the bottom of the Pacific Ocean, underneath the World War 2 nuclear test site Bikini Atoll, it is the setting in which the series' main characters live, and where most of the episodes take place.
Bikini Bottom is similar to an average American city. The population is estimated at 50,000 but the urban/metro area (including Jellyfish Fields) has a population of around 4.5 million . The city consists of various businesses, including restaurants, stores, and manufacturers. The city has a stable economy, a balanced education system, questionable health care(as seen in "The Lost Mattress"), a structured government, and a firm law enforcement system. There are even stadiums, amusement parks, and other recreational facilities. Bikini Bottom first was mentioned in the episode: Plankton! but first appeared in the episode: Hall Monitor.
Bikini Bottom is located at the bottom of the Pacific Ocean, below its signature island, Bikini Atoll, according to Stephen Hillenburg. There are many instances of evidence in the show: After being scared off by ghosts, Sandy Cheeks evacuated to Texas. She was seen flying east from the Pacific Ocean. In the Employee of the Month computer game, a fish mentions that Bikini Bottom is located in the Pacific Ocean. In The SpongeBob SquarePants Movie, when SpongeBob was singing the "Goofy Goober Rock", the camera rose out of the water into outer space. When it did, it came out of the Pacific Ocean. In the TV commercial "Plankton's Holiday Hits", Bikini Bottom is revealed to be part of the United States, and its residents Americans. Bikini Bottom is placed beneath its namesake island, Bikini Atoll, in the Pacific Ocean. Bikini Bottom's location at the bottom of the Pacific Ocean is mentioned or referred to in several different episodes, and in the movie, The SpongeBob SquarePants Movie.