When you get right down to it, only only place is called out as having a dwarven kingdom -- the Blackspine Mountains, east of the city of Rebec (in the north), and north of the Golden Cave. Kingdom has this to say:
To the north east of the Evening Lands, the Black Spine Mountains are tall, rugged and largely unexplored. Their peaks soar far above the plains that surround them, perpetually coated in a layer of ice and snow that catches the rays of the sun in a dazzling glow. Within the mountains, goblin and dwarves have their realms - explorers say that if you wander the wrong paths in the mountains you'll wind up in a land of endless peaks where dwarves and goblins fight never-ending battles under a red sun. Bordering on the Kingdom the most noted goblin realm is called Blazzak, home to the clans under the leadership of King Grazzil that have menaced the city of Rebeck on many occasions. Currently the goblins are in an uneasy truce with the Kingdom, which invariably is a result of them directing their antagonism towards the dwarves, such that the tunnels of the mountains ring with their battles. The dwarven realm they fight with is called Fireheart, led by Queen Darrum, also in the Black Spine Mountains. The dwarves are friendly to Fesselmark but keep themselves to themselves, having the typical stoic demeanour of the less travelled of their kind.
Any mountains are a possibility (including some we invent), though I'll note that the Cragtops specifically are known for once being the realm of Livenscar, where mad wizards over-reached and summoned forces they could not control. The mountains were shattered and corrupted, and the place remains blighted and damned to his day. Honheim, the city in the southeast, was built too close to the Cragtops and eventually paid the price -- two hundred years ago it was destroyed by marauding unmen from the Cragtops.
That help?