Unknown Wonderland

The Unknown Wonderland is a world underground, deep within the center of the earth. The Superfriends discovered the place when they fell through a fissure located 721 miles northeast of Honolulu, Hawaii. The Unknown Wonderland is rich with huge plants of wide varieties.

Inhabitants

 * Tar Creatures
 * Dinosaurs
 * Carnivorous plants
 * Giant jellyfish
 * Rock monster

Locations

 * Un-named Atlantean city
 * Subterranean sea

Appearance
Superfriends
 * Season 3: Battle at the Earth's Core