A very rough hard environment with rough terrain. Metal and small rivers are everywhere. Silica pearls can be found in ponds connected to rivers or waterfalls. Yutyrannus and Carnos control this place and are constantly devouring the passive spawns. An entrance to The Abyss can also be found here
Once you take control over the native predators, typically Yutyrannus and their Carno minions, this place becomes an excellent base site, with an almost unlimited supply of metal, crystal and silica pearl.
Tundra Cave can be found behind certain water falls, which leads to The Abyss. It also holds an abundant amount of crystal.