North of the Greater Himalayas in western Nepal, ~6,100 metre Tibetan Border Ranges form the Ganges-Brahmaputra divide, which the international border generally follows. South of the Greater Himalayas, Nepal has a High Mountain region of ~4,000 metre summits, then the Middle Hills and Mahabharat Range with 1,500 to 3,000 metre summits. South of the Mahabharats, an outer range of foothills with ~1,000 metre summits is called the Siwaliks or Churiya Hills.