The 100th Valley of Poison,
In the centermost region of the Hundred Valleys of Poison, the whole 100th Valley was actually a vast sea with greenish poisonous water filling it. At the center of the enormous sea, there were three long mountain ranges above the water's surface. They eventually met at a particular point, forming a steep cliff. When one watched from the top of the cliff below, one could only see red-dense vegetation below it. This was the infamous Redcliffe Pilgrimage, the freaking gold mine of the cultivator but also known as the tombs of immortal cultivators as over 90% of cultivators who went inside this place never came out.
No one could directly fly down to it, as this small valley of red vegetation had a natural law of its own. The only way into the valley was to descend directly from that steep cliff. Otherwise, even those cultivators in the Boundless realm would even die trying to fly down the red valley.
