Underdark
The Underdark is the enormous system of subterranean caves, caverns, and tunnels located beneath the surface of Toril.
Geography
World Above: The name that those who live in the Underdark give the surface area of Toril.
Upperdark: The first 3 miles (4.8 kilometers) below the surface. It is here where the surface dwellers and those in the Underdark most often meet.
Middledark: Located 3 to 10 miles (4.8 to 16 kilometers) below the surface, this layer is where most of the Underdark cities are located.
Lowerdark: 10 miles (16 kilometers) or more below the surface, the Lowerdark is where even those who know the Underdark are loath to go.
The Underdark is not one giant cavern under Faerûn, but rather many huge networks of caverns and caves. As a result, it is not always possible to travel from one end of the Underdark to the other. The Underdark is divided into several domains that are similar to continents of the world above. While it is possible to travel from one place to another within a domain, separate domains tend to have very few passages linking them. The major domains of the Underdark are the Buried Realms, the Darklands, the Deep Wastes, the Earthroot, the Glimmersea, Great Bhaerynden, the Northdark, and Old Shanatar.
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