The Southern Swamp is a location from The Legend of Zelda: Majora's Mask. Here Link has to rescue Koume in the Woods of Mystery and head to the Deku Palace. From there he ventures to Woodfall Temple to save the Deku Princess, and in doing so spares the life of the Innocent Monkey who is being held captive by the Deku King. Several Pieces of Heart can be obtained in the Southern Swamp, along with various masks.