Great Serpent's Backbone

The Great Serpent's Backbone (大蛇の背骨), or Backbone of the Greatserpent, is an enormous mountain range separating the northern continents of El Phildin and Tirasweel from the southern Weltluna, which is named after its shape.

Background
According to the Ambisch creation myth, the mountain range came into existence following a battle between the giant Thanatosis and the Great Serpent. The battle continued no less than four moonrises. In the end, Thanatosis's fist defeated the Serpent and swung its corpse over his shoulder, announcing his victory with a loud roar. The Giant's Tracks, the two lakes near Amdera, were created under the giant's weight.

Thantosis then tossed aside the Great Serpent's corpse, which over time became the mountain range now known as the Great Serpent's Backbone. Although the Giant Serpent may have fallen, its heart continues to beat fiercely, its scorching hot blood of lava still surging through the mountain. In fact, the volcano in the southeast referred to as the Great Serpent's Tongue erupted frequently until the Shrine of Igunis was erected. Even now literature describes that it looks like the Great Serpent flicks ints tongue as it measures its prey.

Many adventurers have tried to cross the Great Serpent's Backbone, but none have actually succeeded so far due to the wedge driven between those precipitous ridges. With no one from Weltluna able to ascertain what lies beyond the range, the mountains are also referred to as "the end of the world".