Sprawls

Tarkin stared at the incomplete spheroid, floating serenely in the void, eerily backlit by the solar glow reflected from Despayre. It wasn't even a complete skeleton yet. When done, however, the battle station would be 160 kilometers in diameter. There would be twenty-four zones, twelve in each hemisphere. Every zone, called a sprawl, would have its own food replicators, hangar bays, hydroponics, detention blocks, medical centers, armories, command centers, and every other facility needed to provide service for any mission deemed necessary. In an emergency, auxiliary command centers located in each sprawl provided full weapons and maneuverability control, for a redundancy depth of twice a dozen. When fully operational, the battle station would be the most powerful force in the galaxy, by far.

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Star Wars: Death Star Part 1 Chapter 2