⦿Las Noches 一 Las Noches (虚夜宮 (ラス・ノーチェス), Rasu Nōchesu; Spanish for "The Nights", Japanese for "Hollow Night Palace") is the fortress located in Hueco Mundo and the base of operations for the Arrancar and Espada. The Espada reside here with their army of Arrancar complete with medical facilities and detention wings. Las Noches is a massive fortress which can be seen for miles. It consists of a main building with a domed center surrounded by several large towers and smaller buildings. Atop the dome are five smaller towers, which appear to contain areas such as The Lord's throne rooms and the Espada meeting hall. Like everything else in Hueco Mundo, the main building is colored white.
⦿Forest of Menos 一 The Forest of Menos (メノスの森, Menosu no Mori) is an area below the surface of Hueco Mundo's desert where the average Hollow hide from the Arrancar. The forest is filled with large trees made of a silvery quartz substance. These trees extend to the surface and dot the landscape of the desert in Hueco Mundo. Countless Gillian class Hollow live here and follow the commands of the Guardian of the Forest of Menos and his followers.