The Other Realm is an other-dimensional world set aside as a home for witches, mystical beings and other members of the magical community. It has never been properly defined; it seems to have qualities of an alternate earth (having divisions like Earth similar to Canada and the Caribbean islands) possessing seasonal and astronomical cycles and periods but having characteristics outside the regular Laws of Nature. Said to be millions of light years away from the Mortal Realm (that is Earth and its Solar System), it is accessed through a portal resembling a small black hole or by mystical teleportation aka Molecular Transference. @Zelda Spellman and @Hilda Spellman located their portal in the Linen Closet of their Westbridge residence. The portal doesn't seem to be prejudiced to travelers, often transporting mortals to the Other Realm who stumble through it.
Limbo appears to be a neutral local where all the adjacent parts of the Other Realm can be accessed.
(First appears in Pilot) The Witches Council is the governing force of the Other Realm which presides over witches and seems to be in charge of all other members of magical society as well. Trials, law-forming and decrees are established here.
The Other Realm Prison
The other realm prison is a high security facility in which law breaking witches are imprisoned. Many of the inmates of the prison are 'evil twins' as they are naturally inclined to end up breaking the law.
@Sabrina Spellman 's evil twin Katrina Spellman, and @Zelda Spellman 's evil twin Jezebelda Spellman share a cell together there.
The Other Realm Spa
The Other Realm Spa is an Other Realm Spa that visit for a vacation for some treatments that customers confirm or cancel.
(Appears in Sabrina's Real World) The Other Realm Outlet Mall is a mass outlet mall where witches shop and purchase various items. @Hilda Spellman once got a Borscht Belt from here that forced her to tell 1000 jokes when she wore it.
The Other Realm Employment Agency is an agency that grants jobs to witches that need jobs.
Witch Camp is like a Military school that is run by very strict and "sadistic" witches. Witches who fail their Permit test on the first attempt have to be sent there as punishment.
The Republic of Infinite Horror is a part set aside for witches who have lost their powers. It is located on the Lake of Male Superior.
The North Star is a place where the Soul Stones of witches and mortals are kept.
The Rules of the Realm are strict rules that all witches that live in the Other Realm must follow. The rules are always announced by the official Rule Bearer. The Witches Council is also the important mainly organization in the Other Realm with laws that govern the magical population in both the mortal and the other realm.
Astronomy is mentioned from time to time. The most prominent showing is in where @Hilda Spellman , @Zelda Spellman and @Sabrina Spellman go for a vacation. This indicates that witches use other planets for remote locations. Venus was also mentioned to have a currency way lower than Earth, when it was mentioned in a New Mexican deli opened up at Orion's Belt. Many witches are also born in bizarre places in the galaxy, such as Aunt Irma who was born in The Big Dipper (which was mentioned as an armpit) and Amanda is from the fourth galaxy of the Other Realm.