Mount Megeshra was a mountain on Peladon. (TV: The Monster of Peladon) It was divided into a light and dark side. (PROSE: Legacy) A network of tunnels near Megeshra led directly into the mines. (TV: The Monster of Peladon)
After King Erak conquered Peladon, he had his subjects build a castle on the top of Mount Megeshra, which eventually became known as the Citadel of Peladon. When Sherak overthrew Erak, he took the castle for himself.
In 3935, Ettis hid a sonic lance in a cave on Megeshra which overlooked the castle, which he planned to destroy. Azaxyr fitted the device with a self-destruct mechanism which, when activated, blew it up, killing Ettis. Eckersley also hid his spaceship behind Megeshra. (TV: The Monster of Peladon)