Omashu is the second largest city in the Earth Kingdom and the capital of one of its provinces. Omashu is located in the Kolau Mountain Range in the southwestern Earth Kingdom. Earthbenders built the city several centuries ago by carving it out of a mountain. The mountain on which it's built rises out of a deep chasm and the only way to get to the gates of Omashu is by walking a long, narrow path over the deep gorge.
