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Isla Sirena was surrounded by mist which helped disguise its presence as nothing more than sea mist to sailors. Water surrounding the island were inhabited by at least one sea beast. The island was primarily home to the Sirens, who used the mermaids as their agents to lure sailors to their doom. The island moved between Davy Jones' Locker and wherever in the surface world the Sirens wish it to be located.
A young Jack Sparrow visited the island twice during his adventures in his teenage years. Jack's first visit was a result of his crew of the Barnacle falling captive to the song of the mermaids. Though the song immediately took control of Jack's crewmates, it somehow had no effect on Jack himself. Following Arabella Smith's sudden attempt to reunite with her mother, whom she thought was dead, Jack was attacked by a group of mermaids, and was hardly able to return to his ship.
But when an ivory white hand beacons him to return to the sea, he was unable to resist, and found himself devoured by a whirlpool, which led him to Isla Sirena. Jack would then meet with the Siren's mermaid agents: Morveren, Aquala and Aquila. The island vanished from the face of earth after Sparrow and his crew made their deal with the Sirens. After Jack returned with the Sword of Cortés, the Sirens dragged him to the great chamber beneath Isla Sirena. After Jack managed to get rid of the Iguana monsters in the duel which allowed him to recover his freedom, he teleported back from Isla Sirena to the Barnacle in order to search the voodoo priestess Tia Dalma, who was now in possession of the Eye of Stone-Eyed Sam. It's unknown if Isla Sirena was ever visited again or even if ever returned to the face of the earth.
Behind the scenes
- Isla Sirena is the Spanish term for "Mermaid Island".
- Other than Isla Sirena, mermaids also lived in Whitecap Bay, as revealed in On Stranger Tides.