Sharn is by far the largest city in Khorvaire, with an official population of over two and a half million people. Humans make up about a third of that number, and dwarves are a sixth of it; the rest is a blend of every humanoid race found across Khorvaire. Halflings, elves, and gnomes all have a significant presence in the city, but even kalashtar and changelings have communities in Sharn. The city is also home to a community of owlin, a race found nowhere else in Khorvaire. Beyond the permanent population, tens of thousands of people pass through Sharn every day. Refugees from the war still find their way to the city, along with tourists, spies, merchants, and folk hoping to find their fortune in the grandest city in Eberron.
Sharn stands above the Dagger River and its eastern tributary, the Hilt. It's an important port for anyone dealing with Aerenal, Xen'drik, or Sarlona. Mountains line the shores of the Dagger, and Sharn can't spread out. So instead it has grown ever upward.
Sharn sits within a manifest zone linked to Syrania, the Azure Sky. This manifest zone enhances magic related to flying and levitation, which makes many of Sharn's magical wonders possible. The vast majority of the magic items used within the city to facilitate flight only function because of the manifest zone, and work less well or not at all beyond its boundaries.
At the hub of each of these quarters is a cluster of enormous core towers. A web of bridges and platforms connects many of these vast spires, and smaller turrets sprout from the edges of the core towers. The district of Skyway floats above the highest towers, while the tunnels of the Cogs stretch out below the lower city.
In between those extremes, each of the quarters is divided into an upper ward, a middle ward, and a lower ward. Each ward is made up of a number of districts, so that the location of a place in Sharn can be expressed with a combination of a ward name and a district name.