Dark Continent

The Dark Continent (, Ankoku Tairiku) is the part of the world that doesn't appear on the world map. Other types of human beings live there. It is also said that it's where the Magical Beasts come from. The known world where normal humans live is inside a great lake called Mobius in the Dark Continent. In reality, the ancestors of the human race have apparently originated from the Dark Continent, as the deciphering of myths and the study of ancient ruins seem to testify.

Background
It is written on ancient artifacts that disasters occurred every time humanity had tried to go there. An agreement established by the V5 to never go there was made 200 years ago.

Over the past few years, there were 149 attempted voyages to the Dark Continent which were recorded. Out of all the people who participated in these voyages, only 28 people from 5 voyages returned. All the 28 survivors had great physical strength and amazing luck. Only 3 of them managed to clear all the post-testing and return to their daily lives. This means that the rate of survival in the Dark Continent is merely 0.04%. The five successful voyages were all voyages that were not sanctioned by the V5 and are therefore known as unofficial voyages with the help of "guides", that are said to be a beastly humanoid race. Without them, it would be impossible for humans to get past the world's ocean borders.

At the end of each of the five successful voyages, as a collateral damage, humanity brought back Five Threats: the botanical weapon Brion, the gaseous life-form Ai, the twin snake Hellbell, the human feeding beast Pap, and the immortality disease Zobae. Ging has revealed that a person by the name of Don Freecss had traveled the Dark Continent alone 300 years ago, and is the author of the traveler's guide Journey to the New World.

Dark Continent Expedition arc
The Dark Continent was introduced when Ging talks to Gon about someday wanting to explore it. Soon after that the King of the Kakin Empire, Nasubi Hui Guo Rou, finances an expedition to explore it, in which Beyond Netero is the leader of a group of experts who are interested in joueas it is merely near its border.