Maze Island

The Adventure of Link
Maze Island is a rather large island in Hyrule that, like its name suggests, is a natural labyrinth.

Narrow passageways lined by unclimbable rock walls, impassable rivers with only the occasional bridge across them, and hidden pitfalls make traveling on this island both dangerous and time-consuming.

Maze Island's single most famous landmark is the Maze Island Palace, which Link visits during his quest to wake the sleeping Princess Zelda.

Maze Island is also the name of an island in Phantom Hourglass. It is unknown if they are related.

Phantom Hourglass
In Phantom Hourglass, Maze Island can be found in the Northeastern Sea, however it is initially unmarked. It contains three increasingly difficult mazes: Beginner, Normal and Expert. To finish each difficulty level, it is required for Link to hit all the Gossip Stones that appear once the maze opens. Completing the Beginner difficulty gets Link a Wisdom Gem, and finishing the Normal difficulty nets him a Treasure Map. Only by completing Expert will the island relinquish its Heart Container.