This range runs westward from
the place where the Crystalmists and Hellfurnaces
meet. It separates the Dry Steppes from the ghastly
Sea of Dust (q.v.). It can only be supposed what can
be found in these mountains, for no certain information
is available to us. Reports of Drow are not
uncommon. A torturous pass supposedly exists, enabling
passage from the Dry Steppes into the Sea of
Dust or eastward into the kindlier lands of the
Flanaess.
-

Sulhaut	Encounter
01-03	Demi-humans (01-05 = Dwarf, 06-70 = Elf, 71-80 = Gnome, 81-100 = Hobbit)
04-10	Elves, Drow (night only)
11-12	Giants (01-02 = Cloud Giant, 03-04 = Ettin, 05-06 = Fire Giant, 07-08 = Fog Giant, 09-10 Frost Giant, 11-80 Hill Giant, 81-82 = Mountain Giant, 83-85 = Stoner Giant, 86 = Storm Giant, 87 = Titan, 88-99 = Giant Troll, 00 = Giant Two-Headed Troll)
13-17	Humanoids (01-05 = Gnoll*, 06-10 = Goblin, 11-15 = Hobgoblin, 16-94 = Orc**, 95 = Qullan, 96-100 = Xvart)
18-25	Men, Nomads1
26-40	Men, Tribesmen
41-60	Use Pleistocene Conditions Encounter Table
61-00	Use Standard Encounter Tables

* 10% of all gnoll encounters will include flinds.
** 5% of all orc encounters will include ogrillons.

¹Nomads appear only in extreme north of Sulhaut Mountains.

SUBTROPICAL AND TROPICAL WILDERNESS Mountains (d8+d12)

2	Aarakocra
3	Dragon, Black
4	Wind Walker
5	Dragon, Red
6	Caveman
7	Dragon, Copper
8	Bugbear
9	Spider, Large
10	Pteradactyl, Small <Pteranodon>
11	Dog, Wild
12	Bat
13	Ogre
14	Giant, Fire
15	Manticore
16	Firedrake
17	Giant, Storm
18	Pyrolisk
19	Ogre Magi
20	Grue, Elemental

Yes, I had the Sulhaut Mountains as the "Lost world" setting in my compaign, although we never did much of anything there as events kept the PCs bust elsewhere.