The Swamp Palace is a dungeon from The Legend of Zelda: A Link Between Worlds. Located in Lorule's swamp, it can only be entered with the use of the Hookshot.
Story[]
Spoiler warning: Plot or ending details follow.
After entering Lorule for the first time, Princess Hilda informs Link he must save the Seven Sages trapped in portraits by Yuga. During Link's quest, he eventually makes his way to the Swamp Palace, which he is unable to enter due to the water inside the dungeon. After using a Bomb Flower to unblock the flow of water, Link enters the dungeon, where he defeats Arrghus and rescues Oren.
Spoiler warning: Spoilers end here.
Dungeon[]
The puzzles in the Swamp Palace rely primarily on the Hookshot. Link must also use devices to raise and lower the water level.