Menzoberrenzan and Drow Life

[Valandil]

I'm just curious as to how vast the Drow areas really are. I've searched the Dark Dominion tunnels in all directions from Menzo and come up with only dead ends. It seems that the only areas existing are those dead ending tunnels, Menzo, and the Isle of Rothe....am I wrong?

Gameplay down there is getting a tad boring without anything new to explore and the rarity of running into another Drow to interact with.

edit: Not to mention you eventually run out of things to sacrifice to Lloth that please her, thus apparently dead ending favor gain.