Mountain in the Misty Mountains. The Caradhras was one of the three Mountains of Moria under which lay the ancient Dwarf realm of Khazad-Dum.
On January 11-12, 3019, the Fellowship tried to cross the Misty Mountains at the Caradhras Gate but they were thwarted by a blizzard. They thought they heard shrill cries and howls of laughter and rocks fell down at them from the mountainside. The snow became too deep for them to continue and they were forced to turn back.
As soon as the Fellowship had retreated from the Caradhras Gate there was an avalanche and the pass was completely blocked. They then decided to go under the mountains through the Mines of Moria.