Frost Mountain is a large mountain in the centre of the clans' territory. The mountain has been so named for the light layer of frost covering everything at the top of the mountain.
At the top of the mountain is The Crystal Pool, where medicine cats and their apprentices go every half moon. Every full moon, the clans will gather in the Crystal Cave at the bottom of the mountain for Gatherings.
While the mountain is tall, it isn't steep, meaning that cats can still climb up it without taking all day. The higher up you get, the colder it gets. In Greenleaf, the ice on the Crystal Pool has melted, but it is still very cold.