Encyclopedia Barsoomia Wiki
The information in this article comes from New Adventures on Barsoom and is not written by Edgar Rice Burroughs.

The dead city of Pra-ohn on the dead sea of Korus. It is noted for its spiral azure towers, and its ivory domes. It was once the greatest port on the mightiest ocean on the face of the red planet, before Barsoom's southern ocean receded.

It stood on a granite cliff next to what was once the titanic waterfall where the river En-Kah-Do, sacred to the deity of that name, tumbled into the sea after its thousand mile journey from the Mountains of Zont.