Legend of Zelda: The Wind Waker Easter Egg - Triforce in the Map!

When you've placed all the orbs on the statues on the Triangle Islands, you can notice this on the sea chart:

if you draw (imaginary) lines on the chart like so:

Dragon Roost Island - the Forest haven - Greatfish Island - Dragon Roost Island

Eastern triangle Island - Northern triangle Island - Southern triangle Island - Eastern triangle Island,

You will get a perfect triforce, with the Tower of the Gods sitting in the middle!
The first three have or should have had a temple, the last three are the Islands where you should place the orbs obtained from those temples.

Check it out!