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How have Indus River deposits helped create the Sindh plain?

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Physical map showing the Indus River basin and its drainage network across parts of Pakistan, India, China, and Afghanistan. The map details river courses, tributaries, canals, dams, irrigated and marsh areas, sand regions, and elevation changes with shaded relief. International, disputed, and control boundaries are marked, and a small locator map in the corner shows the basin's position within South Asia. — Indus River The Indus River basin and its drainage network.

The Sindh plain in Pakistan has been primarily built up by the alluvium laid down by the Indus River.1

As the river flows across the plain, its velocity decreases significantly, causing it to deposit accumulated silt on its bed. Over time, this aggradational process has raised the riverbed and its banks higher than the surrounding land. This continuous deposition of alluvial deposits—consisting of silt, sand, clay, and gravel—has shaped the flat, fertile landscape of the Sindh province.1234

Because the riverbed is elevated above the adjacent plain, the Indus is prone to changing its course frequently when its banks give way during floods. This dynamic process of sediment accumulation and channel shifting has been a defining feature of the region's geography for millennia.215