Hueco Mundo

Hueco Mundo is a fictional dimension in the manga and anime series Bleach, where the series' main antagonists, the hollows, reside.

Hueco Mundo is located between the living world and Soul Society, but does not appear to be the Dangai. It can only be accessed by ripping a hole in the dimensional fabric seperating the worlds, or using a special technique known as a garganta (Spanish for throat). According to the shinigami, all hollows dwell in Hueco Mundo regardless of their shape, size, or power.

In the anime, Pluses can also enter Hueco Mundo by unknown means. It is assumed that they are brought there after being abducted by hollows before they are consumed and become hollows themselves, as Orihime Inoue's brother Sora was one such Plus.

Las Noches

• Las Noches (虚夜宮, Spanish for the nights) is a fortress and the base of operations of Sōsuke Aizen, Gin Ichimaru and Kaname Tōsen after defecting from Soul Society. They currently reside there with their army of arrancar. Currently, Uryū Ishida, Ichigo Kurosaki and Yasutora Sado have infiltrated Las Noches in an attempt to rescue Orihime Inoue, who was brought there after being kidnapped by Ulquiorra.

Trivia

• While Hueco Mundo is Spanish for Hollow World, the grammatically correct Spanish phrase would be Mundo Hueco.
• For an unknown reason, the moon is on the opposite lunar phase in Hueco Mundo to what it is in the material world or possibly Soul Society. An example of this can be seen in chapter 241.