| Hills of Elfshima | |
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| Location | Third Earth |
| List of all locations | |
The Hills of Elfshima are a range of hills on Third Earth. Located just beyond the Black Pyramid, these hills hide a terrible secret. When viewed against the silhouette of dawn, the hills resemble a sleeping form. In reality, the hills are not hills at all, but rather a sleeping giant known as the Child of Gorgon who was turned to stone thousands of years ago. The name "Elfshima" is a clue to the true nature of the hills as it is an anagram of "I am flesh".
As part of his plan to destroy the ThunderCats, Mumm-Ra once, reading from the Book of Norvag Naj, used the Mask of Gorgon and the Sword of Omens to awaken the Child of Gorgon. Giving the Mask the power of "Sight Beyond Sight", Mumm-Ra was able to bring to life the giant stone creature. Fortunately, Lynx-O and Bengali were able to attack the giant's inner ear using the ThunderStrike. This caused it to lose its balance and fall to the ground, creating a massive tremor which destroyed the Mask of Gorgon and turned the giant back into the Hills of Elfshima.