This is the northern and eastern cloud realm of the Mystical lands. It stands above all other area's of "normal" horses, above Earth. It is the largest section of Mystical land.
The snow falls constantly and rain is chilled, bringing most foals to their death due to harsh conditions. The sun hardly shines. Yes, the dark cloud realm is here. Rocks and a bit of grass run along but not much, a steep debris created cliff holds on the eastern half.