Ladakh is an administrative territory of India that has been under its control since 1947. The geographical region of Ladakh union territory is the highest altitude plateau region in India (much of it being over 3,000 m), incorporating parts of the Himalayan and Karakoram mountain ranges and the upper Indus River and valley. Political geography Historic Ladakh consists of a number of distinct areas (mainly under Indian rule), including the fairly populous main Indus valley, the more remote Zanskar (in the south) and Nubra valleys (to the north over Khardung La in the Ladakh mountain range, a high motorable pass at ), the almost deserted Aksai Chin (under Chinese rule) and the predominantly Shi'ite Muslim Kargil and Suru valley areas in the west (Kargil being the second most important town in Ladakh). Historically populated by the Ladakhi people, continued immigration and preferential treatment to Kashmiris by the J&K government have led to demographic changes in the Ladakh region. The Baltistan and Skardu area, under Pakistani rule and entirely Muslim, used to be included in what is geographically referred to as Ladakh. Before partition, Baltistan was one of the districts of Ladakh. Skardo was the winter capital of Ladakh while Leh was the summer capital. People of Baltistan and Ladakh speak very similar languages closely related to Tibetan. Naked barley (Urdu: grim), normal barley and wheat are the staple crops all over Ladakh, along with mustard (for oil), lentils and other pulses, and vegetables. The extreme limit of cultivation is at Korzok near the Tso Moriri lake, at 4560 m, said to be among the highest fields in the world. Mountain ranges The mountain ranges in this region were formed over a period of 45 million years by the folding of the Indian Plate into the stationary landmass of Asia. Himalayas were formed from the base material of the Indian plate. Ladakh range The Ladakh Range has no major peaks; its average height is a little less than 6000 metres, and few of its passes are less than 5000 m. Within Ladakh it forms the northern boundary wall of the Indus valley, though when the river enters present-day Indian-controlled Ladakh at Demchok, some 250 km south-east of Leh, it is actually flowing along the foot of the northern flank of these granite mountains, which it crosses by a great gorge close to its confluence with the Hanle River. The Pangong Range