Daan Kac is not just an area, but is the entire known world to it’s populace. Being completely surrounded by mountains and forest has kept the inhabitants isolated from the rest of the continent, and there has been little need to leave the area. While the inhabitants don’t live in absolute peace, for the most part they do not wage direct war on each other either, sticking mostly to themselves (except for the entrepreneurial Goblins, and the animosity between the Orcs and Hobgoblins). They have lived like this for centuries, having had no contact with the races outside of the area.
The Known World