Erkol

Erkol is a fictional city featured in comic books published by DC Comics. It is associated with the Superman line of comic book titles.

Erkol was the oldest existing city on the planet Krypton. It was located on the continent of Urrika. At some point in Krypton's past, a boy named Koll-Mer discovered a strange glowing rock in the Striped River. His father Val-Mer and he brought it to the city's ruling council, where they theorized that the energy the rock was giving off could provide a solution to their energy crisis. While the rock proved highly efficient at night, during the day it actually absorbed solar radiation from the sun.