The Kal Isthmus has long been known as a point of conflict. It is a natural chokepoint, especially with the Tabi Mountains. A single fortress can defend against even the largest of armies. The Swelldon empire had great difficulty crossing the Kal Isthmus. It cost many good soldiers and commanders. In the north, the Union of Kal mans the fortress town of Hegyitang as one against possible invasion from Ket.