The Rock Island Tree has no function besides simply making the island look better. It consists of a large reddish-brown trunk that curves up into two smaller branches (each with two branches of their own) that hold large bushes of dark green leaves. Also, green, ivy-like vines hang from the first of the smaller two branches. At the base of the tree, four bulbous roots anchor it in place a large green bush behind it, presumably on the back side of the island, but perhaps in the water. This tree overlooks the T-Rex Egg nest.
- The Rock Island Tree, the Pink Gumdrop Tree, the Pine Tree, and the Spider Web Tree are the only Pocket God trees that don't provide food.
- When you perform an Earthquake, the Rock Island Tree, along with the Palm Tree, is the only tree that shake itself.
- The Rock Island Tree has appeared in a fan video, where the creator suggest that there would be a spider in it. Obviously, the video was made before the relase of Ep 28: Barking Spider, Crouching Pygmy.
- As of Ep 46: Germs of Endearment, a wooden sign, depicting a skull with crosserà bones, the campfire, and an arrow between them pointing at the fire, appears on the tree when at least one infected Pygmy is on the island. It's a kind of hint, a way to show the players how to get rid of the Pygmies's corpses.