The Endless Swamp was located on the Wild Space planet of Zakuul, named by the natives for its sheer size, it was scarcely populated and devoid of any technology. It was home to many immigrated variants of some creatures, including the Mawvorr from Voss, the Wingmaw from Balmorra, the Lurkers, who were believed to have originally come from an unnamed planet near the Torch Nebula, and the rancors from Dathomir. The only known native species was the arachnid Iknayid.