Azuma - Cascade Mountain

Cascade Mountain is surrounded by a deep lake. Holes in the mountainside have streams flowing from them. Often, steam and water shoots out of the mountaintop, giving it the appearance of a volcano, in a way.
There's an underground spring that's hidden near Cascade Mountain. While many people have tried to find it, none have ever succeeded. The Saikana are thought to live inside the mountain, at the spring. In fact, some say the Saikana are probably extinct, because they never venture out of their hiding place, for many fear the outsiders. This place has been totally untouched by Amett's darkness and the water still runs clear and pristine as ever.