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Why is Gaumukh considered the precise source of the Ganges River?

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Physical map showing the Brahmaputra and Ganges river basins and their drainage networks across northern India, Bangladesh, Nepal, Bhutan, Tibet (China), and Myanmar. The map uses color shading to indicate elevation, from the high Himalayas in brown and white to lowland plains in green, and marks major rivers, tributaries, glaciers, dams, irrigated areas, and regions subject to flooding. An inset locator map highlights the region within South Asia. — Ganges River The Brahmaputra and Ganges river basins and their drainage network.

Gaumukh, which translates to "cow's mouth," is considered the precise source of the Bhagirathi River, a primary headstream of the Ganges River. It is located at the foot of the Gangotri glacier in the Indian state of Uttarakhand at an elevation of nearly 13,000 feet (4,000 meters).12

The site is identified as the source because of its physical appearance, which resembles the mouth of a cow, and its role as the origin point for the glacial meltwater that feeds the Bhagirathi. Beyond its geographical significance, Gaumukh and the Gangotri glacier are held in high regard as sacred sites within Hinduism, deeply connected to the mythological origins of the river goddess Ganga.12