Geography of Ladakh
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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. While the Himalayas were formed from the base material of the Indian plate, the Zanskar Range consists of layers of sediment from the ocean floor, and the Ladakh Range of granite was born of the immense heat generated by the friction between the two plates. In Ladakh, the suture zone between the continental masses runs a little to the south of the Indus Valley. The drift continues and is the cause of the frequent earthquakes in the Himalayan region. Crossing the Himalayas by the dip of the Zoji-la, the crest-line of the range remains at a relatively modest level, the highest peaks near the pass being little more than 5000–5500 m above sea level. South-east of Zoji-la the scale increases, reaching a climax in the mighty massif of Nun-Kun, with two summits over 7000 m.
The Suru and Zanskar valleys form a great trough at the foot of the northern, heavily glaciated flank of the Himalayas, while opposite rise the mountains of the Zanskar range. The Suru River forms the western and northern boundary of the Zanskar range. The Suru, after receiving the combined waters of the Dras and Shingo Rivers a short distance north of Kargil, joins the Indus at Marol in Baltistan, which is now on the Pakistan side of the Line of Control. Rangdum Monastery and the attendant village of Julidok is the last inhabited region in the Suru valley; it is also the destination of the nomadic herdspeople called Bakarwals, who trek up every summer from the Jammu region. From Rangdum the valley rises to 4400 metres at the Pensi-la, the gateway into Zanskar. Kargil, the only town in the Suru valley, was an important staging post on the routes of the trade caravans before 1947, being more or less equidistant, at about 230 kilometres from Srinagar, Leh, Skardo, and Padum. Rangdum, though on the northern side of the Pensi-la, is regarded as socially and culturally part of Zangskar rather than of Suru.
Zanskar consists of troughs of two rivers, the Stod (Doda) and the Lungnak (Tsarap Lingti). One of the Lungnak's main tributaries rises as the Tsarap far away to the east in Rupshu. A little away north of Bara-lacha-la it is joined by the Lingti and another tributary; it then flows north-west before turning abruptly south through a gorge and past Phugtal Gompa to join the Kargyak river descending from Shingo-la, that goes into Himachal Pradesh. The Stod carries meltwater of the Drang-drung glacier below the Pensi-la, and flows down a broad open valley, approaching the Lungnak. As the Zangskar river, their united waters flow northwards through a gorge in the Zanskar range, to join the Indus at Nyemo in Central Ladakh. Zanskar suffers heavy snowfall, and the Pensi-la opens only in June and is blocked again in mid-October. The entire valley is virtually treeless.
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 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 Pang-gong range runs parallel to the Ladakh range some 100 km northwest from Chushul, along the southern shore of the Pang-gong Lake. It is divided from the main range by the Tangtse river. Its highest range is 6700 m, and the northern slopes are heavily glaciated.
The Shyok River rises just below the Karakoram Pass. The region comprising the valley of Shyok and Nubra rivers is known as Nubra. The Karakoram range in Ladakh is not as mighty as in Baltistan. The massifs to the north and east of the Nubra-Siachan line include the Apsarasas group (highest point 7245 m), the Rimo group (highest point 7385 m) and the Teram Kangri group (highest point 7464 m), together with Mamostong Kangri (7526m) and Singhi Kangri (7202 m.) North of the Karakoram lie the Kun-lun mountains. Thus, between Leh and eastern Central Asia, there is a triple barrier—Ladakh range, Karakoram range, and Kun-lun. Nevertheless, a major trade route was established between Leh and Yarkand.
The enormous mass of the Himalayas creates a rain shadow, denying entry to the moisture-laden clouds of the Indian monsoon. Ladakh is thus, a high altitude desert. The main source of water is the winter snowfall on the mountains. The regions on the north flank of the Himalayas—Dras, the Suru valley and Zanskar—experience heavy snowfall and remain virtually cut off from the rest of the country for several months in the year. Summers are short, although long enough to grow crops. The proportion of oxygen is less than in many other places at a comparable altitude because of lack of vegetation. There is little moisture to temper the effects of rarefied air.
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 Tso-Moriri Lake, at 4600 m, said to be the highest fields in the world.
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 5,359 metres (17,582 ft)), 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).
The Baltistan and Skardu / Skardo 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.