The Continent
The unnamed Continent is where the Northern Kingdoms and the Nilfgaardian Empire lie. They are located somewhere on its western coast. Other places on the Continent include the Korath desert, Zerrikania and Haakland. Hannu, Zangwebar, Barsa, and Ofir may or may not be on the same continent as well, though both are described as being "beyond the seas".
Nordling cartographers for ages had claimed that the southernmost part of this landmass was Gemmera and that the lands below belonged to another continent. By the time of the Northern War II however this belief was abandoned.