Nar Shadda
Nar Shaddaa was the largest moon of Nal Hutta. More commonly known as the Vertical City, the Smuggler's Moon and Little Coruscant, Nar Shaddaa was similar to Coruscant in that its surface was entirely overgrown with city sprawl since 24,500 BBY, although unlike Coruscant it was filthy, polluted, and infested with crime.
History
When the Hutts left their homeworld of Varl, they displaced the Evocii, native to Nal Hutta, to Nar Shaddaa. Eventually the moon was annexed by the Hutts, who started building spaceports and docking bays across its surface, some stretching out into orbit. Over the centuries, Nar Shaddaa grew as an important center of interstellar trade. Ancient refueling spires and loading docks reached out from the native soil into orbit. In between these ports, massive vertical cities grew. The urban areas on Nar Shaddaa were known as vertical cities since new layers of housing and entertainment buildings were built on top of older layers. Like Coruscant and Taris, the lower levels fell into disrepair and became havens for the lowest lifeforms (particularly the descendants of the Evocii which mutated into unwholesome savages) on the moon. The Hutts continued to exploit the Evocii in their new home, buying up their land and using them as a cheap labor source.
Though Nar Shaddaa was once a prosperous trade center, it lost its glory as the trade lanes shifted. Eventually, Nar Shaddaa became a criminal haven and gained a reputation of being the center of illegal operations in the galaxy. While much of Coruscant was filled with gleaming apartments and well-maintained skywalks, the entire moon that was Nar Shaddaa was dominated by decaying urban landscape and congested, polluted cities. Now distant from most galactic trade centers, the moon was allowed to run its own affairs with little outside interference.
The moon was protected by often-malfunctioning planetary shields. Anything illegal elsewhere could be bought and sold on Nar Shaddaa, and many young smugglers, pirates and criminals started their careers on the Smugglers' Moon. Various sections of Nar Shaddaa were controlled by the Hutts and other criminal organizations.
Sections of the urbanized moon's vertical city included the Duros sector and the Corellian sector, which contained three bars popular with bounty hunters—the Burning Deck, the Slag Pit, and the Meltdown Café, and another corner tavern called the Orange Lady.
In 3,951 BBY, the moon was visited by the Jedi Exile in her search for Zez-Kai Ell, a Jedi Master who cast her out of the Jedi Order. Ever since the Jedi Civil War ended, Nar Shaddaa became swarmed by thousands (if not millions) of refugees from destroyed worlds across the Galaxy, and still more ex-soldiers from both sides in the conflict choking up its spaces looking for work and/or new homes. Its refugee sector was one of the most crowded in the entire galaxy, and tightly controlled by the Exchange.
Around 1,002 BBY, the Brotherhood of Darkness operated a Sith academy on the world that specialized in the training of Sith Assassins. In 1,000 BBY, after the Battle of Ruusan, Set Harth and Bal Serinus dueled on the moon, but were both imprisoned by a Hutt crimelord. Before her death in 32 BBY at the hands of Darth Maul, native-born Pa'lowick Aneesa Dym and her ship the Dusty Duck called the Smugglers' Moon home. In 28 BBY, the Colicoids took over the spice processing on Nar Shaddaa. Han Solo spent part of his early career as a smuggler on Nar Shaddaa. There, he learned the tricks of the smuggling trade from some of the galaxy's best smugglers such as Salla Zend, Shug Ninx and Roa. He had an apartment on the Smuggler's Moon, which was maintained by his old house-keeping droid ZeeZee, but after he decided to leave the moon for the Corporate Sector, it was left unused.