Southern Triangle Island

In The Wind Waker, this is one of three islands which Link must visit in order to continue his quest. After having received Nayru's Pearl from Jabun, he must visit this island and place the sacred pearl in the hands of the monolith situtated here. Upon doing so on each of the three Triangle Islands, the Tower of the Gods will be rise from beneath the sea.

Trivia
The location of this island is similar to the location of the Desert Palace in ALttP. Also, the Pendant of Wisdom was found there, and Nayru was accosciated with wisdom,so both Nayru's Pearl and N. Triangle Island might be a reference to ALttP.