Geographically, Tibet can be divided into three major areas, the east, north and south. A largely forested area lies to the east, covering approximately one-fourth of the land. The northern area (approximately one half of Tibet), is covered in open grasslands where nomads, sheep and yaks dwell. The southern and central areas contain the major towns of Tibet, including Lhasa, Shigatse, Gyantse and Tsetang. This area is largely agricultural.