What characteristic of the Ganges River is notable regarding its population density?

The notable characteristic of the Ganges River regarding its population density is rapid pollution. The Ganges River basin is one of the most densely populated areas in the world, with millions of people relying on the river for various needs, including drinking water, irrigation, and religious activities. Due to the high population density, significant amounts of waste and pollutants are discharged into the river. This includes sewage, industrial effluents, and religious offerings, which contribute to the poor water quality and rapid pollution.

This pollution poses serious health risks to those who depend on the river and affects the ecosystem. While the other options reflect issues that can occur in river systems, they do not directly address the significant impact that high population density has on pollution levels specific to the Ganges. The interplay between human activity and river health is a critical concern for this region, making rapid pollution a defining characteristic of the Ganges River.