Llurth Dreier

Is located 15 kilometers under Shaar west of great rift. Lolth has forsaken this place and the dominant deity is Ghaunadaur Vhaeraun, Kiaransalee and even eilistrsee are also worshipped.

Unlike its other drow city counterparts Lurth Dreier does not follow the ways of Lloth, instead they follow Ghuanadaur. Because of this, their is no open warfare allowed in the city, causing its number to swell above and beyond what other Drow cities in the realms have reached. This, along with the sheer power of the Aboleth / Abobelth Savants that reside in the city might make it the most dangerous place in the Realms, even rivaling Thay in terms of power.

http://www.gemmaline.com/outreterre/carte-llurth-dreir.htm