Humans on Earth have conducted extensive surveys of the surface of Nox using satellites, yet the extent of Nox landmass they have actually explored remains very limited and the number of Nox civilizations they have truly encountered is also extremely small.

The Nox people most closely related to humanity, the Ruvilian, similarly know little about their planet. The more knowledgeable Ruvilian are familiar with the river-crisscrossed Ruvilian Plains, have some knowledge of the saltwater Lake Ruvilia, and can occasionally speak of the mountains and deserts surrounding them, but know nothing of the world beyond. A few travelers have documented the vast and fertile lands beyond the mountains and deserts; their travelogues, written in ancient scripts, are now considered incomprehensible to the Ruvilian people.

The Ruvilian Plains, the Ruvilian Sea, and the rugged hills and mountains surrounding them—this is the area of ​​Nox landmass that humans are currently most familiar with. The Union, borrowing the name of a small, repeatedly contested landing site from the World Wars, calls this land "Small Land." The "Small Land" covers an area of ​​approximately 1.5 million square kilometers, with a total population of about 13 million.

The Republic of Ruvilia, friendly to Earthlings, rules the majority of the Small Land, while the Joint Development Region, inhabited by Earthlings, is nominally part of the Republic. The Kingdom of Walentia, hostile to Earthlings, controls the hills and basins in the north-eastern part of the Small Land. At the easternmost edge of the Small Land lies the Zarab region, a mountain range that is the furthest point humans have ever set foot on The Planet Nox.