What is the name of the city in the clouds in Episode V?

The story behind the answer

Above the gas giant Bespin, the film features a tibanna-gas mining colony with a specific canonical name used by characters. “Bespin City” confuses the planet with a settlement that doesn’t exist in canon, while “Sky City” and “Floating City” are just generic descriptors never spoken in the movie.

Run by Lando Calrissian, this airy metropolis becomes the stage for Darth Vader’s trap, Han Solo’s carbonite freezing, and Luke’s fateful duel. Its elegant, saucer-like silhouette and pastel skies sprang from Ralph McQuarrie’s concept art and ILM’s groundbreaking matte paintings and miniatures, creating one of The Empire Strikes Back’s most iconic locations.