Much about the island is unknown or unexplored but many of its features are shown. But there is a cage where Triton is trapped in with a lock on the cage door. Also there is a bus stop on the edge of the island where people can enter/exit the island. Even there is a phone booth right across from the cage. There is a jungle at the back of the island. There is a mountain next to the jungle.
Triton was locked there in a cage by his father, Neptune. Neptune locked him there for thousands of years until he learned to become a proper god. SpongeBob and Patrick went there to free Triton so Neptune could see him for his 5,000th birthday.
The Island in the Sky may be a parody to Angel Island from the Sonic the Hedgehog series which is also an island that floats in the sky.
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