THE WITCHER UNIVERSE
The stories are set on an unnamed Continent, which was settled several thousand years earlier by elves from overseas. When they arrived, the elves encountered gnomes and dwarves. After a period of war between the elves and dwarves, the dwarves retreated into the mountains and the elves settled in the plains and forests. Human colonists arrived about five hundred years before the events in the stories, igniting a series of wars. The humans were victorious, and became dominant; the non-human races, now considered second-class citizens, often live in small ghettos within human settlements. Those not confined to the ghettos live in wilderness regions not yet claimed by humans. Other races on the Continent are halflings and dryads; werewolves and vampires appeared after a magical event, known as the Conjunction of the Spheres.
During the centuries preceding the stories, most of the Continent’s southern regions have been taken over by the Nilfgaard Empire; the north belongs to the fragmented Northern Kingdoms. The Witcher saga takes place in the aftermath of the first major war between the Nilfgaard Empire and the Northern Kingdoms, with a second war beginning in the middle of the series.
The Continent can be divided into four regions. The Northern Kingdoms (where most of the saga takes place) consists of Aedirn, Cidaris, Cintra, Hengfors League, Kaedwen, Kerack, Kovir and Poviss, Lyria and Rivia, Redania, Temeria and Verden and several minor duchies and principalities such as Bremervoord or Ellander. The Nilfgaard Empire occupies most of the area south of the Northern Kingdoms. The eastern part of the Continent, such as the Korath desert, Zerrikania, Hakland and the Fiery Mountains, is mostly unknown. The book series mentions overseas countries with whom the Northern Kingdoms trade, including Zangvebar, Ofir, Hannu and Barsa. (Wikipedia)