The Callahorn, also known as the Borderlands, is located north of Rainbow Lake, between the Irrybis Mountains and the Mountains of Runne. The region is home to several major cities. The Callahorn is known as the Borderlands because of its position at the center of the Four Lands, separating the Northland from the Southland and the Westland from the Eastland. It is also called the Borderlands because of its committed resistance over the centuries to attempts by the Federation, the main governing body of the Southland, to annex the region.