Makai, also known as the Abyss, is a vast extradimensional space tied to the surroundings of the Earth. It was created over five hundred years ago by four extremely powerful immortal sorcerers, who have ruled over the Makai ever since. The ritual of its creation is said to have lasted more than a decade.
The main purpose of Makai is manipulation of space. Distances have little meaning because anything created inside Makai is defined by its magical signature instead of location. This means that any place can be accessed almost instantly with suitable portals or teleportation spells. On the other hand, it is impossible to get anywhere by common means.
Makai can be accessed from the Earth with portals. A portal has always the same magical signature inside Makai, i.e. it leads to the same place. Although it is difficult to travel long distances on Earth, one can use Makai as a shortcut by entering and exiting different portals inside Makai. Any self-respecting town nowadays has a Makai portal, so it is technically easy to travel anywhere. Of course, a traveler must a passport and possibly a visa and pay the traveling fees collected by the portal administration.
Over the past century, signal traffic trough Makai has been skyrocketing. Communications spells can reach anywhere near a portal almost instantly or connect to any of the data hubs (such as the Makai Wiki) inside Makai. Since the recent development of scripted spell interfaces, the Super Magic-Relayed TelePhones, even those without any ability in magic can communicate with someone on the other side of the globe.