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 four Stone Heads located on the Great Sea: One on the aforementioned Fire Mountain (blocking a shortcut to the exit), 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 mildly resembles that of Ganondorf; it is possible that he created the boulders in his likeness.
 * Head Statues that appear in Phantom Hourglass and Spirit Tracks resemble the Stone Heads.
 * Headstones like these also appear in Marble Blast Gold, serving to block the Marble's path. Since the game was released after The Wind Waker, it is likely that those stones are inspired by their Zelda counterpart.