Bator-Gotha.

It is said, far in the east of Eilendor, an ancient city called Bator-Gotha lies.  Bator-Gotha is older then any known active city, older then Draco Arcora and Arceanum, and is west of the Zurza Archipelago, east of the Gotha Plains, south of the Bator Mountains, and north of the Mountains of Dusk.  It is also the biggest city in all of Eilendor, and most likely the world, it spans many, many miles in all directions and is split in half by the Great Eastern River that flows from the Eastern sea, all the way to Delvair.  The city is home to many races, from Eilendor and beyond the Eastern Sea, or Zurzan Sea, and is ruled by the Ten Guilds, Assassins, Merchants, Paladins, Wizards, Fighters, Thieves, Artificers, Gamblers, Rangers, and Wardens, who fight with each other for dominance in Bator-Gotha.  No one, not even the Guilds, know who built Bator-Gotha, but many people tell tales about a barbarian named Bator, and an archer named Gotha.  Bator-Gotha is famous for it's size, it's brawlers and bar fights, and the Underworld, a night-time place in the old sewers and back alleys, ruled by the Thieves Guild.