Underdark

The World Beneath
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The Underdark is commonly thought to be underneath the material plane, however no matter how deep you dig you'll never reach the Underdark. While the barrier between the Underdark and the material plane is very thin, often entrances appear to be normal caves, ravines, or sinkholes. In rare cases where the barrier is especially thin if travelling underground and you trip or fall you may end up in the Underdark.

The Underdark is an infinitely sprawling connection of tunnels and caves, underground seas, lakes, and rivers can also be found. There have been attempts at mapping the plane but have proven fruitless due to the complexity of locales. Most parts are shrouded in complete darkness while other areas are lit in dim light by glowing fungus or by the settlements and towns that are scattered few and far between.

Many races have made their home in the Underdark such as Derro, Drow¹⁾, Duergar²⁾, and Illithids.³⁾ There are also many monstrous creatures such as Aboleths, Beholders, Cloakers, Kuo-Toa, and Driders.

Drow city of Ridorana
The major city and birthplace for most Drow living today, The city is enormous bigger than most on the surface. Buildings are not only built but carved into the surrounding cave walls and even buildings built off the rocking ceiling and gigantic staligmites.

It is one of three Drow Cities known of in the Underdark and its where the Spider Queen Lolth resides.

Duergar city of Nabundis

Lair of Lord Brigznier

Myconid Forests
The main population of the species known as Myconoids. otherwise peaceful and neutral people that are far from most other dedeziens of the Underdark. Mostly unbothered by all other parties.
An entrance/exit to Vylanna Forest lies here.

The Shadow Realm, also known as the Far Realm, is a place deep within the already deep depths of the Underdark. This maddening realm is feared for its power to twist unfortunate visitors into gruesome monsters, and it was from here that aberrations came, slowly reaching into the Underdark proper and even breaching into Felwind.
Not even Oxtrad's war on the Underdark went as deep as Shadow Realm.

Narkul was banished to this realm when he posed a threat to Mor-Thir.