Demon Lord's Domain

The Demon Lord's Domain is the entire northern area of the continent of Landia, which is occupied by the forces of the Demon Lord.

Location
As stated, the Demon Lord's Domain stretches across the entire northern area of the main continent of Landia, plus several islands in the northern seas. It shares its southern borders with the Gran Chaos Empire, the Nothung Dragon Knight Kingdom and the Union of Eastern Nations. Off to its northwest side is the Spirit Kingdom of Garlan. It's said that the Domain occupies about one-third of the continent of Landia and is about equal in size to the Gran Chaos Empire.

History
Approximately 10 years before the summoning of Kazuya Souma, the north pole of the continent of Landia opened up, allowing a horde of different monsters to enter and begin causing havoc among the surrounding kingdoms, especially the Chaos Kingdom, the predecessor to the Gran Chaos Empire. This caused the many nations to band together to form an allied army in order to push the monsters back. However, the invading allied army that was sent into the Demon Lord's Domain was totally annihilated. At present, the entire region had reached a stalemate with the establishment of the Mankind Declaration Treaty to keep the Demon Lord's Domain from expanding any further.

When it was discovered that Tomoe Inui could actually communicate with the demons and monsters of that area, Kazuya began to suspect that the human kingdoms may have unknowingly started the war against the Demon Lord. Furthermore, after hearing that the soldiers of the Gran Chaos Empire were able to eat monster meat and that demons cooked and ate monsters Kazuya theorized that demons and monsters have a similar relationship to humans and animals.

At present, no one had ever seen the Demon Lord and some question his existence. By the time of Julius Amidonia's exile to the Union of Eastern Nations, there has been an increase in monster attacks along the border with the Demon Lord's Domain. The Demon Lord's Domain was invaded by a joint effort of the White Tiger Kingdom headed by Fuuga and the Oceanic Alliance headed by Souma which includes Fredonia, the Euphoria Kingdom (remnant of the Gran Chaos Empire), the Turgis Republic, and the Dragon Archipelago. They successfully made it to the demons but came to find out that the demons were from a different continent called Seadia. These Seadians were the races of the nothern continent that fled south due to monsters. They cannot close the pathway due to the fact that a manager (one of the humans who originally came to the world) was not present. Souma was able to register himself as one with the watcher of the Seafoam Continent, Mao. Mao has a similar role to Tiamat however she has no real body.

Trivia

 * The entire demon and monster attacks are a complete accident due to Mao being a malfunctioning computer program unable to kill itself; it wants to stop but can't.