Karakoram in the context of "Bactria"

South Asia is the southern subregion of Asia that is defined in both geographical and ethnic-cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's population. As commonly conceptualised, the modern states of South Asia include Bangladesh, Bhutan, India, the Maldives, Nepal, Pakistan, and Sri Lanka, with Afghanistan also often included, which may otherwise be classified as part of Central Asia. South Asia borders East Asia to the northeast, Central Asia to the northwest, West Asia to the west and Southeast Asia to the east. Apart from Southeast Asia, Maritime South Asia is the only subregion of Asia that lies partly within the Southern Hemisphere. The British Indian Ocean Territory and two out of 26 atolls of the Maldives in South Asia lie entirely within the Southern Hemisphere. Topographically, it is dominated by the Indian subcontinent and is bounded by the Indian Ocean in the south, and the Himalayas, Karakoram, and Pamir Mountains in the north.

Settled life emerged on the Indian subcontinent in the western margins of the Indus River Basin 9,000 years ago, evolving gradually into the Indus Valley Civilisation of the third millennium BCE. By 1200 BCE, an archaic form of Sanskrit, an Indo-European language, had diffused into India from the northwest, with the Dravidian languages being supplanted in the northern and western regions. By 400 BCE, stratification and exclusion by caste had emerged within Hinduism, and Buddhism and Jainism had arisen, proclaiming social orders unlinked to heredity.

The Indus (/ˈɪndəs/ IN-dəs) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The 3,180 km (1,980 mi) river rises in western China, flows northwest through the disputed Kashmir region, first through the Indian-administered Ladakh, and then the Pakistani-administered Gilgit-Baltistan, bends sharply to the left after the Nanga Parbat massif, and flows south-by-southwest through Pakistan, before bifurcating and emptying into the Arabian Sea, its main stem located near the port city of Karachi.

The Indus River has a total drainage area of circa 1,120,000 km (430,000 sq mi). Its estimated annual flow is around 175 km/a (5,500 m/s), making it one of the 50 largest rivers in the world in terms of average annual flow. Its left-bank tributary in Ladakh is the Zanskar River, and its left-bank tributary in the plains is the Panjnad River which is formed by the successive confluences of the five Punjab rivers, namely the Chenab, Jhelum, Ravi, Beas, and Sutlej rivers. Its principal right-bank tributaries are the Shyok, Gilgit, Kabul, Kurram, and Gomal rivers. Beginning in a mountain spring and fed with glaciers and rivers in the Himalayan, Karakoram, and Hindu Kush ranges, the river supports the ecosystems of temperate forests, plains, and arid countryside.

The Himalayas, or Himalaya, is a mountain range in Asia separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the Earth's highest peaks, including the highest, Mount Everest. More than 100 peaks exceeding elevations of 7,200 m (23,600 ft) above sea level lie in the Himalayas.

The Himalayas abut on or cross territories of six countries: Nepal, India, China, Bhutan, Pakistan and Afghanistan. The sovereignty of the range in the Kashmir region is disputed among India, Pakistan, and China. The Himalayan range is bordered on the northwest by the Karakoram and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the Indo-Gangetic Plain. Some of the world's major rivers, the Indus, the Ganges, and the Tsangpo–Brahmaputra, rise in the vicinity of the Himalayas, and their combined drainage basin is home to some 600 million people; 53 million people live in the Himalayas. The Himalayas have profoundly shaped the cultures of South Asia and Tibet. Many Himalayan peaks are sacred in Hinduism and Buddhism. The summits of several—Kangchenjunga (from the Indian side), Gangkhar Puensum, Machapuchare, Nanda Devi, and Kailash in the Tibetan Transhimalaya—are off-limits to climbers.

Ladakh (English: /ləˈdɑːk/, Hindi: [ləd̪ːaːx]) is a region administered by India as a union territory and constitutes an eastern portion of the larger Kashmir region that has been the subject of a dispute between India and Pakistan since 1947 and India and China since 1959. Ladakh is bordered by the Tibet Autonomous Region to the east, the Indian state of Himachal Pradesh to the south, both the Indian-administered union territory of Jammu and Kashmir and the Pakistan-administered Gilgit-Baltistan to the west, and the southwest corner of Xinjiang across the Karakoram Pass in the far north. It extends from the Siachen Glacier in the Karakoram range to the north to the main Great Himalayas to the south. The eastern end, consisting of the uninhabited Aksai Chin plains, is claimed by the Indian Government as part of Ladakh, but has been under Chinese control.

In the past, Ladakh gained importance from its strategic location at the crossroads of important trade routes, but as Chinese authorities closed the borders between Tibet Autonomous Region and Ladakh in the 1960s, international trade dwindled. Since 1974, the Government of India has successfully encouraged tourism in Ladakh. As Ladakh is strategically important, the Indian military maintains a strong presence in the region.

The Trans-Karakoram Tract (Chinese: 喀喇昆仑走廊; pinyin: Kālǎkūnlún zǒuláng), also known as the Shaksgam Tract (Urdu: شکسگام, romanized: Shaksgām), is an area of approximately 5,200 km (2,000 sq mi) north of the Karakoram watershed, including the Shaksgam valley. The tract is administered by China as part of its Taxkorgan and Yecheng counties in the Xinjiang Uyghur Autonomous Region. Originally, the Indian government claimed sovereignty over the Shaksgam tract following the accession of Jammu and Kashmir to India in 1947. However, Pakistan took control of the region during the First India-Pakistan War and subsequently ceded it to China in 1963 through the Sino-Pakistan Agreement, and a border based on actual ground positions was recognized as the international border by China and Pakistan. The Shaksgam Tract, along with the entire Kashmir region, is claimed by India. Further, New Delhi has never accepted the China-Pakistan boundary pact, asserting that Islamabad "unlawfully" attempted to cede the area to Beijing.

Most of the tract is composed of the Shaksgam Valley and was formerly administered as part of Shigar, a district (formerly a tehsil) in the Baltistan region. A polo ground in Shaksgam was built by the Amacha Royal family of Shigar, and the Rajas of Shigar used to invite the Amirs of Hotan to play polo there. Most of the names of the mountains, lakes, rivers and passes are in Balti/Ladakhi, suggesting that this land had been part of Baltistan/Ladakh region for a long time.

Gandhara (IAST: Gandhāra) was an ancient Indo-Aryan civilisation in present-day northwestern Pakistan and eastern Afghanistan. The core of the region of Gandhara was the Peshawar and Swat valleys, extending up to Kabul and Bagram in the west and the Pothohar Plateau in the east. However, the cultural influence of Greater Gandhara extended as far as the Bamyan valley in the west and the Karakoram range in the northeast. The region was a central location for the spread of Buddhism to Central and East Asia, with many Chinese Buddhist pilgrims visiting the region.

Between the third century BCE and third century CE, Gāndhārī, a Middle Indo-Aryan language written in the Kharosthi script and linked with the modern Dardic language family, acted as the lingua franca of the region, and through Buddhism, the language spread as far as China based on Gandhāran Buddhist texts. Famed for its unique Gandharan style of art, the region attained its height from the 1st century to the 5th century CE under the Kushan Empire, which had their twin capitals at Kapiśi and Puruṣapura, ushering the period known as Pax Kushana.

The Hindu Kush is an 800-kilometre-long (500 mi) mountain range in Central and South Asia to the west of the Himalayas. It stretches from central and eastern Afghanistan into northwestern Pakistan and far southeastern Tajikistan. The range forms the western section of the Hindu Kush Himalayan Region (HKH); to the north, near its northeastern end, the Hindu Kush buttresses the Pamir Mountains to the north near the point where the borders of China, Pakistan and Afghanistan meet, after which it runs southwest through Pakistan and into Afghanistan near their border.

The eastern end of the Hindu Kush merges with the Karakoram Range. Towards its southern end, it connects with the White Mountains near the Kabul River. It divides the valley of the Amu Darya (the ancient Oxus) to the north from the Indus River valley to the south. The range has numerous high snow-capped peaks, with the highest point being Tirich Mir or Terichmir at 7,708 metres (25,289 ft) in the Chitral District of Khyber Pakhtunkhwa, Pakistan.

The Pamir Mountains are a range of mountains between Central Asia and South Asia. They are located at a junction with other notable mountains, namely the Tian Shan, the Karakoram, the Kunlun, the Hindu Kush, and the Himalayas. They are among the world's highest mountains.

Much of the range lies in the Gorno-Badakhshan region of Tajikistan. Spanning the border parts of four countries, to the south, they border the Hindu Kush mountains along Afghanistan's Wakhan Corridor in Badakhshan Province, Chitral and Gilgit-Baltistan regions of Pakistan. To the north, they join the Tian Shan mountains along the Alay Valley of Kyrgyzstan. To the east, they extend to the range that includes China's Kongur Tagh, in the "Eastern Pamirs", separated by the Yarkand valley from the Kunlun Mountains.