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Indus River

River in Asia

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The deepest canyon in the world, the Indus Gorge with Nanga Parbat, the world's 9th highest mountain rising to the south. The Silk Route (Near Gilgit), Pakistan
Heavyrunner · CC BY-SA 3.0

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The Indus River has a total drainage area of circa 1,120,000 km2 (430,000 mi2). Its estimated annual flow is around 175 km3/a (5,500 m3/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.

Geologically, the headwaters of the Indus and to their east those of the Yarlung Tsangpo (later in its course, the Brahmaputra) flow along the Indus-Yarlung suture zone, which defines the boundary along which the Indian plate collided with the Eurasian plate in the Early Eocene (approximately 50 Million years ago). These two Eurasian rivers, whose courses were continually diverted by the rising Himalayas, define the western and eastern limits, respectively, of the mountain range. After the Indus debouches from its narrow Himalayan valley, it forms, along with its tributaries, the Punjab region of South Asia. The lower course of the river ends in a large delta.

Historically, the Indus was important to many cultures. The 3rd millennium BC saw the rise of Indus Valley Civilisation, a major urban civilization of the Bronze Age. During the 2nd millennium BC, the Punjab region was mentioned in the Rigveda hymns as Sapta Sindhu and in the Avesta religious texts as Hapta Həndu (both terms mean "seven rivers"). Early historical kingdoms that arose in the Indus Valley include Gandhāra and Sindhu-Sauvīra. The Indus River came into the knowledge of the Western world early in the classical period, when King Darius of Persia sent his Greek subject Scylax of Caryanda to explore the river, c. 515 BC.

Etymology and names

The English language word "Indus" comes from Late Latin Indus (1598), specifically a use of Classical Latin Indus (inhabitant of India, Indian) from ancient Greek Ἰνδός "inhabitant of India, Indian, the River Indus", in turn from Old Persian Hindu, denoting an eastern province of the Achaemenid Empire (hind India, see Hinduš), and Avestan hiṇdu, həṇdu "river"; with same Proto Indo-Iranian language-root as Sanskrit sindhu (IPA: , river); hence also the region of the Indus, from which also derive Hellenistic Greek Σίνθος "the River Indus" and Hindustan "land of the river Indus." The river's traditional name in Sanskrit and Tibetan is "Sindhu". In Sanskrit, its range of meanings includes: stream, river; Indus; flood; sea or ocean; region or country in the vicinity of the Indus, Sindh, people of Sindh."

The modern name in Urdu is Sindh or Daryā-i-Sindh, contrasting it to the province of Sindh (Subah-i-Sindh). The Ladakhis and Tibetans call the river Senge Tsangpo (སེང་གེ་གཙང་པོ།), Baltis call it Gemtsuh and Tsuh-Fo, Pashtuns call it Sher Darya and Abbasin, while Sindhis call it Sindhu, Mehran, Purali and Samundar.

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