The Underdark burrowed deep under the Trackless Sea, stretching between the continents of Maztica and Faerûn. This meant maps of the Underdark were highly unreliable. Some areas were always changing over time because of underground magma rivers or the emptying of underground lakes due to cracks in the rock formed by earthquakes. This varied landscape was as dynamic as the surface of Abeir-Toril. The Underdark's underground landscape varied from small subterranean fissures almost impossible for adventurers to crawl through, to wide expanses of deep water that hid coral caves, hollowed out sections of ice in which creatures lived, and places where fungus, bones, or even pure force formed 'caves.' The major domains of the Underdark were the Buried Realms, the Darklands, the Deep Wastes, the Earthroot, the Glimmersea, Great Bhaerynden, the Northdark, and Old Shanatar. While it was possible to travel from one place to another within a domain, separate domains tended to have very few passages linking them. The Underdark was divided into several domains that were similar to continents of the world above. As a result, it was not always possible to travel from one end of the Underdark to the other. The Underdark was not one giant cavern under Faerûn, but rather, many huge networks of caverns and caves. Lowerdark 10 miles (16 kilometers) or more below the surface, the Lowerdark was where even those who knew the Underdark were loath to go. Middledark Located 3 to 10 miles (4.8 to 16 kilometers) below the surface, this layer was where most of the Underdark cities were located. It was here where the surface dwellers and those in the Underdark most often met. Upperdark The first 3 miles (4.8 kilometers) below the surface. The name those who lived in the Underdark gave the surface. Geography World Above The surface area of Toril.

Dnd plants and fungi of the realms pdf