The mines of Moria is a underground tunnel of passages and great halls. Located below the Misty Mountains. It's where the dwarves once dwelled and also buried their dead in tombs. At the entrance there's a kraken who guards the way in, but if you speak friend in elvish the way will open. The dwarves are long dead and the city overrun with goblins. There is also the Balrog that dwells in fire and ash, and to get out of Moria you must figure out the the halls and many tunnels. Otherwise face the goblins and be killed.