At the peak of the rocky, crescent-shaped island in eastern Fire Nation waters stands Avatar Roku's temple. Built by Avatar Roku himself, the multitiered temple contains numerous passageways that extend underground, mechanisms that require firebending to operate, a large atrium supported by massive stone columns, and a spiraling staircase that leads to a sanctuary. The sanctuary was designed to receive a shaft of sunlight through a giant ruby at sundown on the winter solstice. The light illuminates the statue of Avatar Roku, enabling communication with him. Two large, heavily decorated doors designed to open only by either a fully realized Avatar or with five simultaneous fire blasts protect the sanctuary from intruders.