Ment
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Even if you search for dwarves, I think "Misty Mountains," which is an underground cave system with a lot of monsters, is the most reasonable option.
It's not a very good clue, but it's DEFINITE.
Moria is the only city that is essentially a COMPLEX OF CAVES.
The rest are either fortresses, mountains, or forests.
The first and original inhabitants of the Misty Mountains (more precisely, the underground cave system located beneath them) were the dwarves of the Durin clan, the founder of the legendary kingdom of Kazad-Dum.
Moria (correctly Moria – from Sindarin Moria; also known as Khazad-Dum, Khadhodrond, and Furunargian)