Cialmader

Location: Near the Badlands, easter Wild Fire Isle
Former Population: Unknown, estimated over 100,000
Current Status: Most dangerous of ruins.
Known Dangers: Dragon rot, cursed soil, feral drakes, and ground fissures
  Cialmader was once the religious and military heart of the Dragonborn war effort, a citadel-temple carved into a caldera, surrounded by tiered basalt terraces and stormforged statues. It was here that the dragonborn performed their sacred bindings, and where the last great flame-speakers of the empire delivered their fire-prayers to the Tiamat.   When Cialmader fell, it did not simply burn, it ruptured. Now the soil around the city is blackened and foul. Roots curl away from the earth, birds avoid its skies, and even the sun seems dulled by its presence.