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In page Geography of Pakistan:

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The name Indus comes from the Sanskrit word सिंधु (Sindhu), as mentioned, one of the Rigvedic rivers, from which also come the words Sindh, Hindu, and India.[1] The Indus, one of the great rivers of the world, rises in southwestern Tibet only about 160 kilometres west of the source of the Sutlej River, which then itself flows through Punjab, India and joins the Indus in Pakistani Punjab. The catchment area of the Indus is estimated at almost 1 million square kilometres, and all of Pakistan's major rivers—the Kabul, Jhelum, and Chenab—flow into it. The Indus River basin is a large, fertile alluvial plain formed by silt from the Indus. This area has been inhabited by agricultural civilizations for at least 5,000 years.[citation needed]