It appears as a small island with sand in the middle of the ocean. Its most notable landmarks are the three palm trees that inhabit one side of the island. It appears small, but in reality, it is much larger and appears small because of an optical illusion.
On the other side of the island, there is a forest filled with an array of wildlife and a skeleton who previously guarded the Magic Book.
Bikini Atoll has been around for millennia. The trees that inhabit the island have had its ancestors during the times of prehistory.
At one point, Davy Jones was either on the island or at least had the Magic Book, which previously resided on the island.
After Sandy is frightened by SpongeBob and Patrick (as ghosts), she leaves Bikini Bottom and travels back to Texas via an acorn-shaped rocket, which launches out of the ocean and to the landmark of Austin, Texas.
The island appears when Burger Beard arrives on the island to retrieve a magical book. Here, it is revealed that the island is much larger than it was previous established with the 3 pine trees revealed to be massive, probably around the size of small skyscrapers surrounded by a forest of smaller, normal-sized palm trees and bushes. It also appears at the end of the movie when Burger Beard is sent back there by Plankton. That is where Burger Beard and the seagulls sing the SpongeBob SquarePants Theme Song.
The island is the main place where Patchy the Pirate and some of SpongeBob's biggest fans celebrate SpongeBob Appreciation Day.
In "The String," the island gets destroyed when SpongeBob unravels all of Bikini Bottom and the Milky Way with the string.
The episode "Mrs. Puff, You're Fired" includes the footage from "No Weenies Allowed" where SpongeBob is flung out of the water and back in again.
In real life, Bikini Atoll was used by the United States for nuclear bomb testing from the year 1946 until 1958.
In 2015, SpongeBob's voice actor, Tom Kenny confirmed the fictitious city is named after Bikini Atoll. He once debunked a popular internet fan theory that said the series' characters of Bikini Bottom was the result of a nuclear testing.
Starting with "Lame and Fortune," a CGI model of the island is used instead of the filmed island.
This is because the original model island has not aged well. It's also because the original model island got buried somewhere deep within the Stephen Hillenburg storage facility, where he rented to pile things that he didn't have room for in his house.
When the island is shown at night, a human finger is visible in the water to portray a reflection of the moon.