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Forsaken Fortress is the first dungeon Link visits in The Wind Waker. It's an ominous island, and most people tend to avoid it.[1] The stone fortress is well-guarded with cannons, searchlights, and hordes of Miniblins, Bokoblins, and Moblins, who patrol and attack any would-be invaders.[2] The Helmaroc King has made his home on the Forsaken Fortress as Ganondorf's servant.[3] It was also the place where Link's sister, Aryll, was held prisoner, along with Mila and Maggie.[4][5][6]
you're looking for the two temples so you can get past those stupid barrier things so you'll want Sectors F5, C6 and B2 on your sea chart, it's one of the more boring parts of the game but it's enjoyable nonetheless imo