Crescent Moon Island

Crescent Moon Island is one of the islands of the Great Sea in The Wind Waker, named for its likeness to the moon phase. Located northeast of Windfall Island, it is one of the islands where the Ghost Ship appears frequently (in this case, on nights when the moon is full). A Treasure Chart can be found on top of the crescent, as well as a submarine in the vicing waters.

This is the only island in the entire game with two blue Chuchus, which give it extra value; also, giant jars on floating barrels can be found, although they sink when Link is too close to them (it's advised to break the jars from a distance and attract the freed items with the Boomerang). Likewise, after retrieving and opening one of the treasure charts from Dragon Roost Cavern, a Heart Piece can be unveiled from the Sea's depths.

Trivia

 * An island with a similar name, Crescent Island, appears in Oracle of Ages.