Deep Gnomes in Faerun

[Theogon]

Where do Svirfneblins live except Northdark? Is there any place near Dalelands or Cormyr?

[Harperfan7]

Couldn't tell you, but it probably doesn't matter because of portals and what not.

Try to find the underdark book, it has a map of faeruns underdark.