Hueco Mundo is located between the Human world and Soul Society, though it is separate from the bordering dimension known as Dangai. It can only be accessed by tearing the dimensional fabric separating the worlds, allowing Hollows to travel to any other dimension at will. Depending on the Hollow, the effect of this process varies. Regular Hollows usually appear from a small black vortex or form out of smoke, while Menos-class Hollows quite literally tear the sky apart to emerge. Arrancar use a more stable variant of the latter technique known as Garganta.
The landscape of Hueco Mundo is a seemingly never-ending white desert, with dunes like those of the Sahara. The desert is littered with what appear to be boulders and shrivelled trees, but these are actually a form of quartz. In Hueco Mundo, the moon is on the opposite lunar phase of that in the Human World. The vast desert also seems to lack any bodies of water. Like in Soul Society, the atmosphere is filled with Reiryoku in the form of Reishi, but it is more concentrated, thus allowing smaller Hollows to gain nourishment despite the lack of Human souls.
