Bikini Top is another city in the Pacific Ocean. It is above Bikini Bottom. It has been mentioned on five different tweets on Twitter. It was mentioned on two of Patrick's tweets and three of SpongeBob's tweets.
It is possible that Bikini Top is the island that resides above Bikini Bottom since SpongeBob once wrote, "To get there, all you have to do is be in Bikini Bottom and turn straight up."
It once controlled Bikini Bottom before Bikini Bottom declared independence from Bikini Top on July 4th.