Neos Underdark

Drowlands: Upperdark/Middledark. under peninsulan provinces, cutting out about two thirds through Foline and tailing up to the closest Northern Isle, touching the Herrisland Islands along the way. Underdesert: Lowerdark. The largest underdark zone, placed under the Soultorn Desert. Drops straight into the Abyss at many locations (through magical means, not physical).   The Great Gorge: Upperdark. Located above Froskusten, in the Crystalline Sea. Primarily Upperdark, the ceiling collapsed under the weight of water long ago. Creatures often rise form the Great Gorge and attack Froskusten, hence the nation’s strong culture towards sea monster fighting. This is because the Great Gorge is located right next to the coastal shelf, allowing monsters a border with easy ocean.   Pillars to Nothing: All Levels. Located below the Salted Steppes. The massive stalactite-like pillars that connect to the ceiling are located in the Upperdark, however they drop all the way down to the middledark, with a massive drop below all the way to the Pillared Planes, located in the Lowerdark. Some of these pillars even ascend into the Steppes themselves, though just barely. the Tower of Siidu, which is the most direct way to access this portion of the Underdark.   Remnants of Talesia: Middledark. Located below the Talesian Sea, stretching westward to the Talesian Tail. Ancient ruins older than any man, dwarf or elf dot the vast expanse of empty space. Crevices of varying size dot the expanse, stopped only by cave walls. The expanse is far from flat, spanning many vertical miles throughout the Middledark.   Black Scale: Upperdark. Located to the east of the Purple Bastion under the Orc Wilds. This area of the Underdark is home to a massive amount of Kobold. Some Lizardfolk live here as well, usually serving as rulers over the kobold tribes. They often come up from the surface in raiding parties to hunt, causing a considerable amount of trouble to nearby nations.   Forsaken Mines: Middledark. Located below the mid southern Iron Mountains. Due to Duergar mining, hundreds of thousands of additional tunnels have been excavated in the normal Underdark tunnels that snake their way through this area. This makes the entire area exponentially harder to navigate without a guide. However, there are also ores in the area that cannot be found anywhere else.   The Mind Web: Lowerdark. Located below the Savage Gouse and the Goblin Wilds north of the Belluskan Emirate. The tunnels in this section of the underdark are unlike any others. While in other locations, tunnels seem to arc and weave in meaningless directions, intersecting with others as they go, the tunnels in the Mind Web appear systematic in their design. Almost as if forming an enormous brain, calculating to an unknown purpose. Many goblins have made the mistake of traveling to this section of the Underdark, and quickly fall under the array’s spell, traveling further and further down until lost forever. It is unknown to scholars why goblins are affected in this manner whilst more advanced humanoids are not, however speculation lies in the giblin’s rudimentary intelligence.