Stone Watcher

Stone Heads are enormous boulders found in The Wind Waker, five times Link's size and impossible for him to lift unaided. The Power Bracelet, the treasure of Fire Mountain, gives Link enough strength to lift these gargantuan rocks, similar to the power of the Silver Gauntlets in Ocarina of Time. There are only three Stone Heads located on the Great Sea: one on Stone Watcher Island, one on Outset Island blocking the entrance to the Savage Labyrinth, and the last one at Headstone Island blocking the entrance to the Earth Temple.

Trivia
The face portrayed on the boulders resembles that of Ganondorf - it is possible that he created the boulders in his likeness.