Bespin is the planet in The Empire Strikes Back over which Cloud City hovers suspended by an antigravity pod. Bespin is also a major source of tibanna gas , which is refined for production and transport in Cloud City. It is home to several million individuals - including humans and Ugnaughts.

The planet Bespin is a gas giant that is about 118,000 kilometers in diameter. Like most gas giants, it has a solid core made of metal followed by layers of metallic gasses. Most of the layers of gas are poisonious, and the pressure and temperature are far above what a human could tolerate. But from approximately 150 to 180 kilometers down from space there is a habitable layer known as the Bespin Life Zone. This layer has an oxygen atmosphere with the temperature and pressure that makes it ideal for human life. It is in this layer that Cloud City is located. Like most gas giants, Bespin has a number of moons. Bespin has a 12 hour day, and completes a revolution around its sun about every 14 years.

The Millennium Falcon, by Han Solo's admission, just barely made it there from the Anoat system without hyperdrive.

Lando Calrissian, the previous owner of the Millennium Falcon, administered Cloud City and provided well-paying jobs for the Ugnaughts until the Galactic Empire took over.